The tiger (Panthera tigris) is the largest species among the Felidae and classified in the genus Panthera. It is most recognisable for its dark vertical stripes on orangish-brown fur with a lighter underside. It is an apex predator, primarily preying on ungulates such as deer and wild boar. It is territorial and generally a solitary but social predator, requiring large contiguous areas of habitat, which support its requirements for prey and rearing of its offspring. Tiger cubs stay with their mother for about two years, before they become independent and leave their mother's home range to establish their own.
Temporal range: Early Pleistocene – Present
|A Bengal tigress in Tadoba Andhari Tiger Reserve, Maharashtra, India|
|Tiger's historical range in about 1850 (pale yellow) and in 2006 (in green).|
The tiger once ranged widely from the Eastern Anatolia Region in the west to the Amur River basin, and in the south from the foothills of the Himalayas to Bali in the Sunda islands. Since the early 20th century, tiger populations have lost at least 93% of their historic range and have been extirpated in Western and Central Asia, from the islands of Java and Bali, and in large areas of Southeast and South Asia and China. Today's tiger range is fragmented, stretching from Siberian temperate forests to subtropical and tropical forests on the Indian subcontinent and Sumatra. The tiger is listed as Endangered on the IUCN Red List since 1986. As of 2015, the global wild tiger population was estimated to number between 3,062 and 3,948 mature individuals, down from around 100,000 at the start of the 20th century, with most remaining populations occurring in small pockets isolated from each other. Major reasons for population decline include habitat destruction, habitat fragmentation and poaching. This, coupled with the fact that it lives in some of the more densely populated places on Earth, has caused significant conflicts with humans.
The tiger is among the most recognisable and popular of the world's charismatic megafauna. It featured prominently in ancient mythology and folklore and continues to be depicted in modern films and literature, appearing on many flags, coats of arms and as mascots for sporting teams. The tiger is the national animal of India, Bangladesh, Malaysia and South Korea.
The Middle English tigre and Old English tigras (plural) derive from Old French tigre, from Latin tigris. This was a borrowing of Classical Greek τίγρις 'tigris', a foreign borrowing of unknown origin meaning 'tiger' as well as the river Tigris. The origin may have been the Persian word tigra meaning 'pointed or sharp', and the Avestan word tigrhi 'arrow', perhaps referring to the speed of the tiger's leap, although these words are not known to have any meanings associated with tigers.
The generic name Panthera is traceable to the Old French word 'pantère', the Latin word panthera, and the Ancient Greek word πάνθηρ 'panther'. The Sanskrit word पाण्डर pând-ara means 'pale yellow, whitish, white'.
Taxonomy and genetics
In 1758, Carl Linnaeus described the tiger in his work Systema Naturae and gave it the scientific name Felis tigris. In 1929, the British taxonomist Reginald Innes Pocock subordinated the species under the genus Panthera using the scientific name Panthera tigris.
Following Linnaeus's first descriptions of the species, several tiger specimens were described and proposed as subspecies. The validity of several tiger subspecies was questioned in 1999. Most putative subspecies described in the 19th and 20th centuries were distinguished on basis of fur length and colouration, striping patterns and body size, hence characteristics that vary widely within populations. Morphologically, tigers from different regions vary little, and gene flow between populations in those regions is considered to have been possible during the Pleistocene. Therefore, it was proposed to recognize only two tiger subspecies as valid, namely P. t. tigris in mainland Asia, and P. t. sondaica in the Greater Sunda Islands.
Results of craniological analysis of 111 tiger skulls from Southeast Asian range countries indicate that Sumatran tiger skulls differ from Indochinese and Javan tiger skulls, whereas Bali tiger skulls are similar in size to Javan tiger skulls. The authors proposed to classify Sumatran and Javan tiger as distinct species, P. sumatrae and P. sondaica with Bali tiger as subspecies P. sondaica balica.
In 2015, morphological, ecological and molecular traits of all putative tiger subspecies were analysed in a combined approach. Results support distinction of the two evolutionary groups continental and Sunda tigers. The authors proposed recognition of only two subspecies, namely P. t. tigris comprising the Bengal, Malayan, Indochinese, South Chinese, Siberian and Caspian tiger populations, and P. t. sondaica comprising the Javan, Bali and Sumatran tiger populations. The authors also noted that this reclassification will affect tiger conservation management. The nominate subspecies P. t. tigris constitutes two clades:
- a northern clade composed of the Siberian and Caspian tiger populations
- a southern clade composed of all other mainland populations.
One conservation specialist welcomed this proposal as it would make captive breeding programmes and future rewilding of zoo-born tigers easier. One geneticist was sceptical of this study and maintained that the currently recognised nine subspecies can be distinguished genetically.
In 2017, the Cat Classification Task Force of the IUCN Cat Specialist Group revised felid taxonomy and recognized the tiger populations in continental Asia as P. t. tigris, and those in the Sunda Islands as P. t. sondaica. The following tables are based on the classification of the species Panthera tigris provided in Mammal Species of the World. It also reflects the classification used by the Cat Classification Task Force in 2017:
|Bengal tiger||Linnaeus's scientific description of the tiger was based on descriptions by earlier naturalists such as Conrad Gessner and Ulisse Aldrovandi. Bengal tiger skins in the collection of the Natural History Museum, London vary from light yellow to reddish yellow with black stripes.|
formerly P. t. virgata (Illiger, 1815)
|Illiger's description was not based on a particular specimen, but he only assumed that tigers in the Caspian area differ from those elsewhere. It was later described as having narrow and closely set stripes. The size of its skull did not differ significantly from that of the Bengal tiger. According to genetic analysis, it was closely related to the Siberian tiger. It had been recorded in the wild until the early 1970s and is considered extinct since the late 20th century.|
formerly P. t. altaica (Temminck, 1844)
|Temminck's description was based on an unspecified number of tiger skins with long hairs and dense coats that were traded between Korea and Japan. He assumed they originated in the Altai Mountains. The Siberian tiger was later described as having pale coats with few dark brown stripes.|
|South China tiger
formerly P. t. amoyensis (Hilzheimer, 1905)
|Hilzheimer's description was based on five tiger skulls purchased in Hankou, southern China. These skulls differed in the size of teeth and jaw bones by a few cm from skulls of tigers from India. Skins of tigers from southern China in the fur trade were said to be vivid orange in colour with rhombus-like stripes. Because of differences in the shape of skulls, it was long thought to constitute the most ancient variety. It was noted to have a unique mtDNA haplotype.|
formerly P. t. corbetti Mazák, 1968
|Mazák's description was based on 25 specimens in museum collections that were smaller than tigers from India and had smaller skulls.|
formerly P. t. jacksoni Luo et al., 2004
|It was proposed as a distinct subspecies on the basis of mtDNA and micro-satellite sequences that differ from the Indochinese tiger. In pelage colour or skull size, it does not differ significantly from Indochinese tigers. There is no clear geographical barrier between tiger populations in northern Malaysia and southern Thailand.|
|Javan tiger||Temminck based his description on an unspecified number of tiger skins with short and smooth hair. Tigers from Java were small compared to tigers of the Asian mainland.|
formerly P. t. balica (Schwarz, 1912)
|Schwarz based his description on a skin and a skull of an adult female tiger from Bali. He argued that its fur colour is brighter and its skull smaller than of tigers from Java. A typical feature of Bali tiger skulls is the narrow occipital plane, which is analogous with the shape of skulls of Javan tigers.|
formerly P. t. sumatrae Pocock, 1929
|Pocock described a dark skin of a tiger from Sumatra as type specimen that had numerous and densely-set broad stripes. Its skull was a little larger than the skull of a tiger from Bali. It is the smallest of all living tigers. The reasons for its small size compared to mainland tigers are unclear, but probably the result of competition for limited and small prey. The population is thought to be of Asia mainland origin and to have been isolated about 6,000 to 12,000 years ago after a rise in sea-level created Sumatra.|
A study published in 2018 was based on 32 tiger specimens using the whole-genome sequencing approach for analysis. Results support six monophyletic tiger clades corresponding with the living subspecies and indicate that the most recent common ancestor lived about 110,000 years ago.
The tiger's closest living relatives were previously thought to be the Panthera species lion, leopard and jaguar. Results of genetic analysis indicate that about 2.88 million years ago, the tiger and the snow leopard lineages diverged from the other Panthera species, and that both may be more closely related to each other than to the lion, leopard and jaguar. The geographic origin of the Panthera is most likely northern Central Asia. The tiger–snow leopard lineage dispersed in Southeast Asia during the Miocene.
Panthera zdanskyi is considered to be a sister taxon of the modern tiger. It lived at the beginning of the Pleistocene about two million years ago, its fossil remains were excavated in Gansu province of northwestern China. It is considered to have been more "primitive", but functionally and ecologically similar to the modern tiger. Northwestern China is thought to be the origin of the tiger lineage. Tigers grew in size, possibly in response to adaptive radiations of prey species like deer and bovids, which may have occurred in Southeast Asia during the Early Pleistocene.
Panthera tigris trinilensis lived about 1.2 million years ago and is known from fossils excavated near Trinil in Java. The Wanhsien, Ngandong, Trinil and Japanese tigers became extinct in prehistoric times. Tigers reached India and northern Asia in the late Pleistocene, reaching eastern Beringia, Japan, and Sakhalin. Some fossil skulls are morphologically distinct from lion skulls, which could indicate tiger presence in Alaska during the last glacial period, about 100,000 years ago.
In the Philippine island of Palawan, two articulated phalanx bones were found amidst an assemblage of other animal bones and stone tools in Ille Cave near the village of New Ibajay. They were smaller than mainland tiger fossils, possibly due to insular dwarfism. Otherwise, it would appear that early humans had accumulated the bones, so it may be that the tiger parts were imported from elsewhere, or that the tiger colonised Palawan from Borneo before the Holocene, considering the proximity of the two islands. Fossil remains of tigers were also excavated in Sri Lanka, China, Japan and Sarawak (Malaysia) dating to the late Pliocene, Pleistocene and Early Holocene. The Bornean tiger was apparently present in Borneo between the Late Pleistocene and the Holocene, but whether it went extinct in prehistoric or recent times has not been resolved.
The potential tiger range during the Late Pleistocene and Holocene was predicted applying ecological niche modelling based on more than 500 tiger locality records combined with bioclimatic data. The resulting model shows a contiguous tiger range from southern India to Siberia at the Last Glacial Maximum, indicating an unobstructed gene flow between tiger populations in mainland Asia throughout the Late Pleistocene and Holocene. The tiger populations on the Sunda Islands and mainland Asia were possibly separated during interglacial periods. Results of a phylogeographic study indicate that all living tigers had a common ancestor 72,000–108,000 years ago. The tiger's full genome sequence was published in 2013. It was found to have similar repeat composition to other cat genomes and an appreciably conserved synteny.
Captive tigers were bred with lions to create hybrids called liger and tigon. They share physical and behavioural qualities of both parent species. Breeding hybrids is now discouraged due to the emphasis on conservation. The liger is a cross between a male lion and a tigress. Ligers are typically between 10 and 12 ft (3.0 and 3.7 m) in length, and weigh between 800 and 1,000 lb (360 and 450 kg) or more. Because the lion sire passes on a growth-promoting gene, but the corresponding growth-inhibiting gene from the female tiger is absent, ligers grow far larger than either parent species.
The less common tigon is a cross between a lioness and a male tiger. Because the male tiger does not pass on a growth-promoting gene and the lioness passes on a growth inhibiting gene, tigons are around the same size as their parents. Some females are fertile and have occasionally given birth to litigons when mated to a male Asiatic lion.
The tiger has a muscular body with powerful forelimbs, a large head and a tail that is about half the length of its body. Its pelage is dense and heavy, and colouration varies between shades of orange and brown with white ventral areas and distinctive vertical black stripes that are unique in each individual. Stripes are likely advantageous for camouflage in vegetation such as long grass with strong vertical patterns of light and shade. The tiger is one of only a few striped cat species; it is not known why spotted patterns and rosettes are the more common camouflage pattern among felids. A tiger's coat pattern is still visible when it is shaved. This is not due to skin pigmentation, but to the stubble and hair follicles embedded in the skin, similar to human beards (colloquially five o'clock shadow), and is in common with other big cats. They have a mane-like heavy growth of fur around the neck and jaws and long whiskers, especially in males. The pupils are circular with yellow irises. The small, rounded ears have a prominent white spot on the back, surrounded by black. These spots are thought to play an important role in intraspecific communication.
The tiger's skull is similar to a lion's skull, with the frontal region usually less depressed or flattened, and a slightly longer postorbital region. The lion skull shows broader nasal openings. Due to the variation in skull sizes of the two species, the structure of the lower jaw is a reliable indicator for their identification. The tiger has fairly stout teeth; its somewhat curved canines are the longest among living felids with a crown height of up to 90 mm (3.5 in).
There is a notable sexual dimorphism between males and females, with the latter being consistently smaller than males. The size difference between males and females is proportionally greater in the large tiger subspecies, with males weighing up to 1.7 times more than females. Males also have wider forepaw pads than females, enabling sex to be told from tracks. It has been hypothesised that body size of different tiger populations may be correlated with climate and be explained by thermoregulation and Bergmann's rule, or by distribution and size of available prey species.
Generally, males vary in total length from 250 to 390 cm (8.2 to 12.8 ft) and weigh between 90 and 306 kg (198 and 675 lb) with skull length ranging from 316 to 383 mm (12.4 to 15.1 in). Females vary in total length from 200 to 275 cm (6.56 to 9.02 ft), weigh 65 to 167 kg (143 to 368 lb) with skull length ranging from 268 to 318 mm (0.879 to 1.043 ft). In either sex, the tail represents about 0.6 to 1.1 m (24 to 43 in) of total length. The Bengal and Siberian tigers are amongst the tallest cats in shoulder height. They are also ranked among the biggest cats that have ever existed reaching weights of more than 350 kg (770 lb). The tigers of the Sunda islands are smaller and less heavy than tigers in mainland Asia, rarely exceeding 142 kg (313 lb) in weight.
The white tiger lacks pheomelanin (which creates the orange colour), and has dark sepia-brown stripes and blue eyes. This altered pigmentation is caused by a mutant gene that is inherited as an autosomal recessive trait, which is determined by a white locus. It is not an albino, as the black pigments are scarcely affected. The mutation changes a single amino acid in the transporter protein SLC45A2. Both parents need to have the allele for whiteness to have white cubs. Between the early and mid 20th century, white tigers were recorded and shot in the Indian states of Odisha, Bihar, Assam and in the area of Rewa, Madhya Pradesh. The local maharaja started breeding tigers in the early 1950s and kept a white male tiger together with its normal-coloured daughter; they had white cubs. To preserve this recessive trait, only a few white individuals were used in captive breeding, which led to a high degree of inbreeding. Inbreeding depression is the main reason for many health problems of captive white tigers, including strabismus, stillbirth, deformities and premature death. Other physical defects include cleft palate and scoliosis.
The Tiger Species Survival Plan has condemned the breeding of white tigers, alleging they are of mixed ancestry and of unknown lineage. The genes responsible for white colouration are represented by 0.001% of the population. The disproportionate growth in numbers of white tigers points to inbreeding among homozygous recessive individuals. This would lead to inbreeding depression and loss of genetic variability.
The snow white tiger is a morph with extremely faint stripes and a pale reddish-brown ringed tail. The golden tiger has a pale golden pelage with a blond tone and reddish-brown stripes. Both snow white and golden tigers are homozygous for CORIN gene mutations. These morphs are rarely recorded in the wild.
Distribution and habitat
The tiger historically ranged from eastern Turkey and Transcaucasia to the coast of the Sea of Japan, and from South Asia across Southeast Asia to the Indonesian islands of Sumatra, Java and Bali. Since the end of the last glacial period, it was probably restricted by periods of deep snow lasting longer than six months. Currently, it occurs in less than 6% of its historical range, as it has been extirpated from Southwest and Central Asia, large parts of Southeast and East Asia. It now mainly occurs in the Indian subcontinent, the Indochinese Peninsula, Sumatra and the Russian Far East. In China and Myanmar, breeding populations appear to rely on immigration from neighbouring countries while its status in the Korean Peninsula is unknown.
The tiger is essentially associated with forest habitats. Tiger populations thrive where populations of wild cervids, bovids and suids are stable. On the Indian subcontinent, it mainly inhabits tall grasslands and riverine forests as well as the swamp forests of the Sundarbans. In Thailand, it inhabits mixed deciduous, dry evergreen and dry dipterocarp forests. In Sumatra, tiger populations range from lowland peat swamp forests to rugged montane forests. In the Amur-Ussuri region, it inhabits Korean pine and temperate broadleaf and mixed forests, where riparian forests provide food and water, and serve as dispersal corridors for both tiger and ungulates. Historical records in Iran are known only from the southern coast of the Caspian Sea and adjacent Alborz Mountains. Records in Central Asia indicate that it occurred foremost in Tugay riverine forests along the Atrek, Amu Darya, Syr Darya, Hari, Chu and Ili Rivers and their tributaries. In the Caucasus, it inhabited hilly and lowland forests.
Behaviour and ecology
Social and daily activities
When not subject to human disturbance, the tiger is mainly diurnal. It does not often climb trees but cases have been recorded. It is a strong swimmer and often bathes in ponds, lakes and rivers, thus keeping cool in the heat of the day. Individuals can cross rivers up to 7 km (4.3 mi) wide and can swim up to 29 km (18 mi) in a day. During the 1980s, a tiger was observed frequently hunting prey through deep lake water in Ranthambhore National Park.
The tiger is a long-ranging species, and individuals disperse over distances of up to 650 km (400 mi) to reach tiger populations in other areas. Radio-collared tigers in Chitwan National Park started dispersing from their natal areas earliest at the age of 19 months. Four females dispersed between 0 and 43.2 km (0.0 and 26.8 mi), and 10 males between 9.5 and 65.7 km (5.9 and 40.8 mi). None of them crossed open cultivated areas that were more than 10 km (6.2 mi) wide, but moved through forested habitat.
Adult tigers lead largely solitary lives. They establish and maintain territories but have much wider home ranges within which they roam. Resident adults of either sex generally confine their movements to their home ranges, within which they satisfy their needs and those of their growing cubs. Individuals sharing the same area are aware of each other's movements and activities. The size of the home range mainly depends on prey abundance, geographic area and sex of the individual. In India, home ranges appear to be 50 to 1,000 km2 (19 to 386 sq mi) while in Manchuria, they range from 500 to 4,000 km2 (190 to 1,540 sq mi). In Nepal, defended territories are recorded to be 19 to 151 km2 (7.3 to 58.3 sq mi) for males and 10 to 51 km2 (3.9 to 19.7 sq mi) for females.
Young female tigers establish their first territories close to their mother's. The overlap between the female and her mother's territory reduces with time. Males, however, migrate further than their female counterparts and set out at a younger age to mark out their own area. A young male acquires territory either by seeking out an area devoid of other male tigers, or by living as a transient in another male's territory until he is older and strong enough to challenge the resident male. Young males seeking to establish themselves thereby comprise the highest mortality rate (30–35% per year) amongst adult tigers.
To identify his territory, the male marks trees by spraying urine and anal gland secretions, as well as marking trails with scat and marking trees or the ground with their claws. Females also use these "scrapes", as well as urine and scat markings. Scent markings of this type allow an individual to pick up information on another's identity, sex and reproductive status. Females in oestrus will signal their availability by scent marking more frequently and increasing their vocalisations.
Although for the most part avoiding each other, tigers are not always territorial and relationships between individuals can be complex. An adult of either sex will sometimes share its kill with others, even those who may not be related to them. George Schaller observed a male share a kill with two females and four cubs. Unlike male lions, male tigers allow females and cubs to feed on the kill before the male is finished with it; all involved generally seem to behave amicably, in contrast to the competitive behaviour shown by a lion pride. Stephen Mills described a social feeding event in Ranthambhore National Park:
A dominant tigress they called Padmini killed a 250 kg (550 lb) male nilgai – a very large antelope. They found her at the kill just after dawn with her three 14-month-old cubs, and they watched uninterrupted for the next ten hours. During this period the family was joined by two adult females and one adult male, all offspring from Padmini's previous litters, and by two unrelated tigers, one female the other unidentified. By three o'clock there were no fewer than nine tigers round the kill.
Occasionally, male tigers participate in raising cubs, usually their own, but this is extremely rare and not always well understood. In May 2015, Amur tigers were photographed by camera traps in the Sikhote-Alin Bioshpere Reserve. The photos show a male Amur tiger pass by, followed by a female and three cubs within the span of about two minutes. In Ranthambore, a male Bengal tiger raised and defended two orphaned female cubs after their mother had died of illness. The cubs remained under his care, he supplied them with food, protected them from his rival and sister, and apparently also trained them.
Male tigers are generally more intolerant of other males within their territories than females are of other females. Territory disputes are usually solved by displays of intimidation rather than outright aggression. Several such incidents have been observed in which the subordinate tiger yielded defeat by rolling onto its back and showing its belly in a submissive posture. Once dominance has been established, a male may tolerate a subordinate within his range, as long as they do not live in too close quarters. The most aggressive disputes tend to occur between two males when a female is in oestrus, and sometimes resulted in the death of one of the males.
Facial expressions include the "defense threat", where an individual bares its teeth, flattens its ears and its pupils enlarge. Both males and females show a flehmen response, a characteristic grimace, when sniffing urine markings, but flehmen is more often associated with males detecting the markings made by tigresses in oestrus. Like other Panthera, tigers roar, particularly in aggressive situations, during the mating season or when making a kill. There are two different roars: the "true" roar is made using the hyoid apparatus and forced through an open mouth as it progressively closes, and the shorter, harsher "coughing" roar is made with the mouth open and teeth exposed. The "true" roar can be heard at up to 3 km (1.9 mi) away and is sometimes emitted three or four times in succession. When tense, tigers will moan, a sound similar to a roar but more subdued and made when the mouth is partially or completely closed. Moaning can be heard 400 m (1,300 ft) away. Chuffing—soft, low-frequency snorting similar to purring in smaller cats—is heard in more friendly situations. Other vocal communications include grunts, woofs, snarls, miaows, hisses and growls.
Hunting and diet
In the wild, tigers mostly feed on large and medium-sized mammals, particularly ungulates weighing 60–250 kg (130–550 lb). Range-wide, sambar deer, Manchurian wapiti, barasingha and wild boar are significantly preferred. Tigers are capable of taking down larger prey like adult gaur but will also opportunistically eat much smaller prey, such as monkeys, peafowl and other ground-based birds, hares, porcupines, and fish. They also prey on other predators, including dogs, leopards, pythons, bears, and crocodiles. Tigers generally do not prey on fully grown adult Asian elephants and Indian rhinoceros but incidents have been reported. More often, it is the more vulnerable small calves that are taken. When in close proximity to humans, tigers will also sometimes prey on such domestic livestock as cattle, horses, and donkeys. Although almost exclusively carnivorous, tigers will occasionally eat vegetation for dietary fibre such as fruit of the slow match tree.
Tigers are thought to be mainly nocturnal predators, but in areas where humans are absent, remote-controlled, hidden camera traps recorded them hunting in daylight. They generally hunt alone and ambush their prey as most other cats do, overpowering them from any angle, using their body size and strength to knock the prey off balance. Successful hunts usually require the tiger to almost simultaneously leap onto its quarry, knock it over, and grab the throat or nape with its teeth. Despite their large size, tigers can reach speeds of about 49–65 km/h (30–40 mph) but only in short bursts; consequently, tigers must be close to their prey before they break cover. If the prey catches wind of the tiger's presence before this, the tiger usually abandons the hunt rather than chase prey or battle it head-on. Horizontal leaps of up to 10 m (33 ft) have been reported, although leaps of around half this distance are more typical. One in 2 to 20 hunts, including stalking near potential prey, ends in a successful kill.
When hunting larger animals, tigers prefer to bite the throat and use their powerful forelimbs to hold onto the prey, often simultaneously wrestling it to the ground. The tiger remains latched onto the neck until its target dies of strangulation. By this method, gaurs and water buffaloes weighing over a ton have been killed by tigers weighing about a sixth as much. Although they can kill healthy adults, tigers often select the calves or infirm of very large species. Healthy adult prey of this type can be dangerous to tackle, as long, strong horns, legs and tusks are all potentially fatal to the tiger. No other extant land predator routinely takes on prey this large on its own.
With smaller prey, such as monkeys and hares, the tiger bites the nape, often breaking the spinal cord, piercing the windpipe, or severing the jugular vein or common carotid artery. Though rarely observed, some tigers have been recorded to kill prey by swiping with their paws, which are powerful enough to smash the skulls of domestic cattle, and break the backs of sloth bears.
After killing their prey, tigers sometimes drag it to conceal it in vegetative cover, usually pulling it by grasping with their mouths at the site of the killing bite. This, too, can require great physical strength. In one case, after it had killed an adult gaur, a tiger was observed to drag the massive carcass over a distance of 12 m (39 ft). When 13 men simultaneously tried to drag the same carcass later, they were unable to move it. An adult tiger can go for up to two weeks without eating, then gorge on 34 kg (75 lb) of flesh at one time. In captivity, adult tigers are fed 3 to 6 kg (6.6 to 13.2 lb) of meat a day.
Enemies and competitors
Tigers usually prefer to eat prey they have caught themselves, but are not above eating carrion in times of scarcity and may even pirate prey from other large carnivores. Although predators typically avoid one another, if a prey item is under dispute or a serious competitor is encountered, displays of aggression are common. If these are not sufficient, the conflicts may turn violent; tigers may kill competitors as leopards, dholes, striped hyenas, wolves, bears, pythons, and crocodiles on occasion. Tigers may also prey on these competitors. Attacks on smaller predators, such as badgers, lynxes, and foxes, are almost certainly predatory. Crocodiles, bears, and large packs of dholes may win conflicts against tigers and, in the cases of crocodiles and bears, even can kill them.
The considerably smaller leopard avoids competition from tigers by hunting at different times of the day and hunting different prey. In India's Nagarhole National Park, most prey selected by leopards were from 30 to 175 kg (66 to 386 lb) against a preference for prey weighing over 176 kg (388 lb) in the tigers. The average prey weight in the two respective big cats in India was 37.6 kg (83 lb) against 91.5 kg (202 lb). With relatively abundant prey, tigers and leopards were seen to successfully coexist without competitive exclusion or interspecies dominance hierarchies that may be more common to the African savanna, where the leopard exists with the lion. Golden jackals may feed on the tiger's kills. Tigers appear to inhabit the deep parts of a forest while smaller predators like leopards and dholes are pushed closer to the fringes.
The tiger mates all year round, but most cubs are born between March and June, with a second peak in September. Gestation ranges from 93 to 114 days, with an average of 103 to 105 days. A female is only receptive for three to six days. Mating is frequent and noisy during that time. The female gives birth in a sheltered location such as in tall grass, in a dense thicket, cave or rocky crevice. The father generally takes no part in rearing. Litters consist of two or three cubs, rarely as many as six. Cubs weigh from 780 to 1,600 g (1.72 to 3.53 lb) each at birth, and are born with eyes closed. They open their eyes when they are six to 14 days old. Their milk teeth break through at the age of about two weeks. They start to eat meat at the age of eight weeks. At around this time, females usually shift them to a new den. They make short ventures with their mother, although they do not travel with her as she roams her territory until they are older. Females lactate for five to six months. Around the time they are weaned, they start to accompany their mother on territorial walks and are taught how to hunt.
A dominant cub emerges in most litters, usually a male. The dominant cub is more active than its siblings and takes the lead in their play, eventually leaving its mother and becoming independent earlier. The cubs start hunting on their own earliest at the age of 11 months, and become independent around 18 to 20 months of age. They separate from their mother at the age of two to two and a half years, but continue to grow until the age of five years. Young females reach sexual maturity at three to four years, whereas males at four to five years. Unrelated wandering male tigers often kill cubs to make the female receptive, since the tigress may give birth to another litter within five months if the cubs of the previous litter are lost. The mortality rate of tiger cubs is about 50% in the first two years. Few other predators attack tiger cubs due to the diligence and ferocity of the mother. Apart from humans and other tigers, common causes of cub mortality are starvation, freezing, and accidents. Generation length of the tiger is about eight years. The oldest recorded captive tiger lived for 26 years.
In the 1990s, a new approach to tiger conservation was developed: Tiger Conservation Units (TCUs), which are blocks of habitat that have the potential to host tiger populations in 15 habitat types within five bioregions. Altogether 143 TCUs were identified and prioritized based on size and integrity of habitat, poaching pressure and population status. They range in size from 33 to 155,829 km2 (13 to 60,166 sq mi).
In 2016, an estimate of a global wild tiger population of approximately 3,890 individuals was presented during the Third Asia Ministerial Conference on Tiger Conservation. The WWF subsequently declared that the world's count of wild tigers had risen for the first time in a century.
Major threats to the tiger include habitat destruction, habitat fragmentation and poaching for fur and body parts, which have simultaneously greatly reduced tiger populations in the wild. In India, only 11% of the historical tiger habitat remains due to habitat fragmentation. Demand for tiger parts for use in traditional Chinese medicine has also been cited as a major threat to tiger populations. At the start of the 20th century, it was estimated there were over 100,000 tigers in the wild, but the population has dwindled outside of captivity to between 1,500 and 3,500. Some estimates suggest that there are fewer than 2,500 mature breeding individuals, with no subpopulation containing more than 250 mature breeding individuals. The global wild tiger population was estimated by the World Wide Fund for Nature at 3,200 in 2011 and 3,890 in 2015—Vox reported that this was the first increase in a century.
India is home to the world's largest population of wild tigers. A 2014 census estimated a population of 2,226, a 30% increase since 2011. On International Tiger Day 2019, the 'Tiger Estimation Report 2018’ was released by Prime Minister Narendra Modi. The report estimates a population of 2967 tigers in India with 25% increase since 2014. Modi said "India is one of the safest habitats for tigers as it has achieved the target of doubling the tiger population from 1411 in 2011 to 2967 in 2019".
In 1973, India's Project Tiger, started by Indira Gandhi, established numerous tiger reserves. The project was credited with tripling the number of wild Bengal tigers from some 1,200 in 1973 to over 3,500 in the 1990s, but a 2007 census showed that numbers had dropped back to about 1,400 tigers because of poaching. Following the report, the Indian government pledged $153 million to the initiative, set up measures to combat poaching, promised funds to relocate up to 200,000 villagers in order to reduce human-tiger interactions, and set up eight new tiger reserves. India also reintroduced tigers to the Sariska Tiger Reserve and by 2009 it was claimed that poaching had been effectively countered at Ranthambore National Park.
In the 1940s, the Siberian tiger was on the brink of extinction with only about 40 animals remaining in the wild in Russia. As a result, anti-poaching controls were put in place by the Soviet Union and a network of protected zones (zapovedniks) were instituted, leading to a rise in the population to several hundred. Poaching again became a problem in the 1990s, when the economy of Russia collapsed. The major obstacle in preserving the species is the enormous territory individual tigers require (up to 450 km2 needed by a single female and more for a single male). Current conservation efforts are led by local governments and NGO's in concert with international organisations, such as the World Wide Fund for Nature and the Wildlife Conservation Society. The competitive exclusion of wolves by tigers has been used by Russian conservationists to convince hunters to tolerate the big cats. Tigers have less impact on ungulate populations than do wolves, and are effective in controlling the latter's numbers. In 2005, there were thought to be about 360 animals in Russia, though these exhibited little genetic diversity. However, in a decade later, the Siberian tiger census was estimated from 480 to 540 individuals.
In China, tigers became the target of large-scale ‘anti-pest’ campaigns in the early 1950s, where suitable habitats were fragmented following deforestation and resettlement of people to rural areas, who hunted tigers and prey species. Though tiger hunting was prohibited in 1977, the population continued to decline and is considered extinct in southern China since 2001. In northeastern China's Hunchun National Nature Reserve, camera-traps recorded a tiger with four cubs for the first time in 2012. During subsequent surveys, between 27 and 34 tigers were documented along the China–Russia border. Having earlier rejected the Western-led environmentalist movement, China changed its stance in the 1980s and became a party to the CITES treaty. By 1993 it had banned the trade in tiger parts, and this diminished the use of tiger bones in traditional Chinese medicine. The Tibetan people's trade in tiger skins has also been a threat to tigers. The pelts were used in clothing, tiger-skin chuba being worn as fashion. In 2006 the 14th Dalai Lama was persuaded to take up the issue. Since then there has been a change of attitude, with some Tibetans publicly burning their chubas.
In 1994, the Indonesian Sumatran Tiger Conservation Strategy addressed the potential crisis that tigers faced in Sumatra. The Sumatran Tiger Project (STP) was initiated in June 1995 in and around the Way Kambas National Park in order to ensure the long-term viability of wild Sumatran tigers and to accumulate data on tiger life-history characteristics vital for the management of wild populations. By August 1999, the teams of the STP had evaluated 52 sites of potential tiger habitat in Lampung Province, of which only 15 these were intact enough to contain tigers. In the framework of the STP a community-based conservation programme was initiated to document the tiger-human dimension in the park in order to enable conservation authorities to resolve tiger-human conflicts based on a comprehensive database rather than anecdotes and opinions.
The Wildlife Conservation Society and Panthera Corporation formed the collaboration Tigers Forever, with field sites including the world's largest tiger reserve, the 21,756 km2 (8,400 sq mi) Hukaung Valley in Myanmar. Other reserves were in the Western Ghats in India, Thailand, Laos, Cambodia, the Russian Far East covering in total about 260,000 km2 (100,000 sq mi).
Tigers have been studied in the wild using a variety of techniques. Tiger population have been estimated using plaster casts of their pugmarks, although this method was criticized as being inaccurate. More recent techniques include the use of camera traps and studies of DNA from tiger scat, while radio-collaring has been used to track tigers in the wild. Tiger spray has been found to be just as good, or better, as a source of DNA than scat.
Relation with humans
The tiger has been one of the big five game animals of Asia. Tiger hunting took place on a large scale in the early 19th and 20th centuries, being a recognised and admired sport by the British in colonial India as well as the maharajas and aristocratic class of the erstwhile princely states of pre-independence India. A single maharaja or English hunter could claim to kill over a hundred tigers in their hunting career. Tiger hunting was done by some hunters on foot; others sat up on machans with a goat or buffalo tied out as bait; yet others on elephant-back.
Historically, tigers have been hunted at a large scale so their famous striped skins could be collected. The trade in tiger skins peaked in the 1960s, just before international conservation efforts took effect. By 1977, a tiger skin in an English market was considered to be worth US$4,250.
Tiger parts are commonly used as amulets in South and Southeast Asia. In the Philippines, the fossils in Palawan were found besides stone tools. This, besides the evidence for cuts on the bones, and the use of fire, suggests that early humans had accumulated the bones, and the condition of the tiger subfossils, dated to approximately 12,000 to 9,000 years ago, differed from other fossils in the assemblage, dated to the Upper Paleolithic. The tiger subfossils showed longitudinal fracture of the cortical bone due to weathering, which suggests that they had post-mortem been exposed to light and air. Tiger canines were found in Ambangan sites dating to the 10th to 12th centuries in Butuan, Mindanao.
Many people in China and other parts of Asia have a belief that various tiger parts have medicinal properties, including as pain killers and aphrodisiacs. There is no scientific evidence to support these beliefs. The use of tiger parts in pharmaceutical drugs in China is already banned, and the government has made some offences in connection with tiger poaching punishable by death.[which?] Furthermore, all trade in tiger parts is illegal under the Convention on International Trade in Endangered Species of Wild Fauna and Flora and a domestic trade ban has been in place in China since 1993.
However, the trading of tiger parts in Asia has become a major black market industry and governmental and conservation attempts to stop it have been ineffective to date. Almost all black marketers engaged in the trade are based in China and have either been shipped and sold within in their own country or into Taiwan, South Korea or Japan. The Chinese subspecies was almost completely decimated by killing for commerce due to both the parts and skin trades in the 1950s through the 1970s. Contributing to the illegal trade, there are a number of tiger farms in the country specialising in breeding the cats for profit. It is estimated that between 5,000 and 10,000 captive-bred, semi-tame animals live in these farms today. However, many tigers for traditional medicine black market are wild ones shot or snared by poachers and may be caught anywhere in the tiger's remaining range (from Siberia to India to the Malay Peninsula to Sumatra). In the Asian black market, a tiger penis can be worth the equivalent of around $300 U.S. dollars. In the years of 1990 through 1992, 27 million products with tiger derivatives were found. In July 2014 at an international convention on endangered species in Geneva, Switzerland, a Chinese representative admitted for the first time his government was aware trading in tiger skins was occurring in China.
Wild tigers that have had no prior contact with humans actively avoid interactions with humans. However, tigers cause more human deaths through direct attack than any other wild mammal. Attacks are occasionally provoked, as tigers lash out after being injured while they themselves are hunted. Attacks can be provoked accidentally, as when a human surprises a tiger or inadvertently comes between a mother and her young, or as in a case in rural India when a postman startled a tiger, used to seeing him on foot, by riding a bicycle. Occasionally tigers come to view people as prey. Such attacks are most common in areas where population growth, logging, and farming have put pressure on tiger habitats and reduced their wild prey. Most man-eating tigers are old, missing teeth, and unable to capture their preferred prey. For example, the Champawat Tiger, a tigress found in Nepal and then India, had two broken canines. She was responsible for an estimated 430 human deaths, the most attacks known to be perpetrated by a single wild animal, by the time she was shot in 1907 by Jim Corbett. According to Corbett, tiger attacks on humans are normally in daytime, when people are working outdoors and are not keeping watch. Early writings tend to describe man-eating tigers as cowardly because of their ambush tactics.
Man-eaters have been a particular problem in recent decades in India and Bangladesh, especially in Kumaon, Garhwal and the Sundarbans mangrove swamps of Bengal, where some healthy tigers have hunted humans. Because of rapid habitat loss attributed to climate change, tiger attacks have increased in the Sundarbans. The Sundarbans area had 129 human deaths from tigers from 1969 to 1971. In the 10 years prior to that period, about 100 attacks per year in the Sundarbans, with a high of around 430 in some years of the 1960s. Unusually, in some years in the Sundarbans, more humans are killed by tigers than vice versa. In 1972, India's production of honey and beeswax dropped by 50% when at least 29 people who gathered these materials were devoured. In 1986 in the Sundarbans, since tigers almost always attack from the rear, masks with human faces were worn on the back of the head, on the theory that tigers usually do not attack if seen by their prey. This decreased the number of attacks only temporarily. All other means to prevent attacks, such as providing more prey or using electrified human dummies, worked less well.
In Ancient Roman times, tigers were kept in menageries and amphitheatres to be exhibited, trained and paraded, and were often provoked to fight humans and exotic beasts. Since the 17th century, tigers, being rare and ferocious, were sought after to keep at European castles as symbols of their owners' power. Tigers became central zoo and circus exhibits in the 18th century: a tiger could cost up to 4,000 francs in France (for comparison, a professor of the Beaux-Arts at Lyons earned only 3,000 francs a year), or up to $3,500 in the United States, where a lion cost no more than $1,000.
China (2007) had over 4,000 captive tigers, of which 3,000 were held by about twenty larger facilities, with the rest held by some 200 smaller facilities. The USA (2011) had 2,884 tigers in 468 facilities. Nineteen states have banned private ownership of tigers, fifteen require a license, and sixteen states have no regulation. Genetic ancestry of 105 captive tigers from fourteen countries and regions showed that forty-nine animals belonged distinctly to five subspecies; fifty-two animals had mixed subspecies origins. As such, "many Siberian tigers in zoos today are actually the result of crosses with Bengal tigers."
Tigers and their superlative qualities have been a source of fascination for mankind since ancient times, and they are routinely visible as important cultural and media motifs. They are also considered one of the charismatic megafauna, and are used as the face of conservation campaigns worldwide. In a 2004 online poll conducted by cable television channel Animal Planet, involving more than 50,000 viewers from 73 countries, the tiger was voted the world's favourite animal with 21% of the vote, narrowly beating the dog.
Myth and legend
In Chinese myth and culture, the tiger is one of the 12 animals of the Chinese zodiac. In Chinese art, the tiger is depicted as an earth symbol and equal rival of the Chinese dragon – the two representing matter and spirit respectively. The Southern Chinese martial art Hung Ga is based on the movements of the tiger and the crane. In Imperial China, a tiger was the personification of war and often represented the highest army general (or present day defense secretary), while the emperor and empress were represented by a dragon and phoenix, respectively. The White Tiger (Chinese: 白虎; pinyin: Bái Hǔ) is one of the Four Symbols of the Chinese constellations. It is sometimes called the White Tiger of the West (Chinese: 西方白虎), and it represents the west and the autumn season.
The tiger's tail appears in stories from countries including China and Korea, it being generally inadvisable to grasp a tiger by the tail. In Korean myth and culture, the tiger is regarded as a guardian that drives away evil spirits and a sacred creature that brings good luck – the symbol of courage and absolute power. For the people who live in and around the forests of Korea, the tiger considered the symbol of the Mountain Spirit or King of mountain animals. So, Koreans also called the tigers "San Gun" (산군) means Mountain Lord.
In Buddhism, the tiger is one of the Three Senseless Creatures, symbolising anger, with the monkey representing greed and the deer lovesickness. The Tungusic peoples considered the Siberian tiger a near-deity and often referred to it as "Grandfather" or "Old man". The Udege and Nanai called it "Amba". The Manchu considered the Siberian tiger as "Hu Lin," the king. In Hinduism, the god Shiva wears and sits on tiger skin. The ten-armed warrior goddess Durga rides the tigress (or lioness) Damon into battle. In southern India the god Ayyappan was associated with a tiger. In Greco-Roman tradition, the tiger was depicted being ridden by the god Dionysus.
The weretiger replaces the werewolf in shapeshifting folklore in Asia; in India they were evil sorcerers, while in Indonesia and Malaysia they were somewhat more benign. In the Hindu epic Mahabharata, the tiger is fiercer and more ruthless than the lion.
Literature and media
In William Blake's poem in the Songs of Experience, titled "The Tyger", the tiger is a menacing and fearful animal. In Yann Martel's 2001 Man Booker Prize winning novel Life of Pi, the protagonist, surviving shipwreck for months in a small boat, somehow avoids being eaten by the other survivor, a large Bengal tiger. The story was adapted in Ang Lee's 2012 feature film of the same name. Jim Corbett's 1944 Man-Eaters of Kumaon tells ten true stories of his tiger-hunting exploits in what is now the northern Uttarakhand region of India. The book has sold over four million copies, and has been the basis of both fictional and documentary films. In Rudyard Kipling's 1894 The Jungle Book, the tiger, Shere Khan, is the mortal enemy of the human protagonist, Mowgli. More benign tiger characters include Tigger in A. A. Milne's Winnie-the-Pooh and Hobbes of the comic strip Calvin and Hobbes, both of whom are represented as simply stuffed animals come to life.
Tigers are also mascots for various sports teams around the world. Tony the Tiger is a famous mascot for Kellogg's breakfast cereal Frosted Flakes. The Esso (Exxon) brand of petrol was advertised from 1969 onwards with the slogan 'put a tiger in your tank', and a tiger mascot; more than 2.5 million synthetic tiger tails were sold to motorists, who tied them to their petrol tank caps.
Politics and economics
The tiger is one of the animals displayed on the Pashupati seal of the Indus Valley Civilisation. The tiger was the emblem of the Chola Dynasty and was depicted on coins, seals and banners. The seals of several Chola copper coins show the tiger, the Pandyan emblem fish and the Chera emblem bow, indicating that the Cholas had achieved political supremacy over the latter two dynasties. Gold coins found in Kavilayadavalli in the Nellore district of Andhra Pradesh have motifs of the tiger, bow and some indistinct marks. The tiger symbol of Chola Empire was later adopted by the Liberation Tigers of Tamil Eelam and the tiger became a symbol of the unrecognised state of Tamil Eelam and Tamil independence movement.
The Bengal tiger is the national animal of India and Bangladesh. The Malaysian tiger is the national animal of Malaysia. The Siberian tiger is the national animal of South Korea. Since the successful economies of South Korea, Taiwan, Hong Kong and Singapore were described as the Four Asian Tigers, a tiger economy is a metaphor for a nation in rapid development.
The tyger, a depiction of tigers as they were understood by European artists, is among the creatures used in charges and supporters in European heraldry. This creature has several notable differences from real tigers, including absent stripes, a leonine tufted tail, and a head terminating in large, pointed jaws. A more realistic version of the tiger entered the heraldic armory through the British Empire's expansion into Asia, and is referred to as the Bengal tiger to distinguish it from its older counterpart. The Bengal tiger is not a very common creature in heraldry, but is present as a supporter in the arms of Bombay and emblazoned on the shield of the University of Madras.
- Goodrich, J.; Lynam, A.; Miquelle, D.; Wibisono, H.; Kawanishi, K.; Pattanavibool, A.; Htun, S.; Tempa, T.; Karki, J.; Jhala, Y. & Karanth, U. (2015). "Panthera tigris". IUCN Red List of Threatened Species. IUCN. 2015: e.T15955A50659951.
- Linnaeus, C. (1758). "Felis tigris". Caroli Linnæi Systema naturæ per regna tria naturæ, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis (in Latin). Tomus I (decima, reformata ed.). Holmiae: Laurentius Salvius. p. 41.
- Dinerstein, E.; Loucks, C.; Wikramanayake, E.; Ginsberg, J.; Sanderson, E.; Seidensticker, J.; Forrest, J.; Bryja, G.; Heydlauff, A. (2007). "The Fate of Wild Tigers" (PDF). BioScience. 57 (6): 508–514. doi:10.1641/B570608.
- "tiger". The Free Dictionary. Farlex. Retrieved 6 April 2014.
- Liddell, H. G. & Scott, R. (1940). "τίγρις". A Greek-English Lexicon, revised and augmented. Oxford: Clarendon Press.
- Harper, D. (2001–2011). "Tiger". Online Etymology Dictionary. Etymonline.com. Retrieved 6 April 2014.
- Harper, D. (2001–2011). "Panther". Online Etymology Dictionary. Douglas Harper. Retrieved 24 October 2011.
- Macdonell, A. A. (1929). "पाण्डर pând-ara". A practical Sanskrit dictionary with transliteration, accentuation, and etymological analysis throughout. London: Oxford University Press. p. 95.
- Pocock, R. I. (1929). "Tigers". Journal of the Bombay Natural History Society. 33 (3): 505–541.
- Pocock, R. I. (1939). "Panthera tigris". The Fauna of British India, Including Ceylon and Burma. Mammalia: Volume 1. London: T. Taylor and Francis, Ltd. pp. 197–210.
- Driscoll, C. A.; Yamaguchi, N.; Bar-Gal, G. K.; Roca, A. L.; Luo, S.; MacDonald, D. W.; O'Brien, S. J. (2009). "Mitochondrial Phylogeography Illuminates the Origin of the Extinct Caspian Tiger and Its Relationship to the Amur Tiger". PLoS ONE. 4 (1): e4125. Bibcode:2009PLoSO...4.4125D. doi:10.1371/journal.pone.0004125. PMC 2624500. PMID 19142238.
- Wozencraft, W.C. (2005). "Species Panthera tigris". In Wilson, D.E.; Reeder, D.M (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. p. 546. ISBN 978-0-8018-8221-0. OCLC 62265494.
- Kitchener, A. (1999). "Tiger distribution, phenotypic variation and conservation issues". In Seidensticker, J.; Christie, S.; Jackson, P. (eds.). Riding the Tiger: Tiger Conservation in Human-Dominated Landscapes. Cambridge: Cambridge University Press. pp. 19–39. ISBN 978-0521648356.
- Mazák, J. H.; Groves, C. P. (2006). "A taxonomic revision of the tigers (Panthera tigris) of Southeast Asia". Mammalian Biology, Zeitschrift für Säugetierkunde. 71 (5): 268–287. doi:10.1016/j.mambio.2006.02.007.
- Wilting, A.; Courtiol, A.; Christiansen, P.; Niedballa, J.; Scharf, A. K.; Orlando, L.; Balkenhol, N.; Hofer, H.; Kramer-Schadt, S.; Fickel, J.; Kitchener, A. C. (2015). "Planning tiger recovery: Understanding intraspecific variation for effective conservation". Science Advances. 11 (5: e1400175): e1400175. Bibcode:2015SciA....1E0175W. doi:10.1126/sciadv.1400175. PMC 4640610. PMID 26601191.
- Kupferschmidt, K. (2015). "Controversial study claims there are only two types of tiger". Science. doi:10.1126/science.aac6905. Retrieved 27 June 2015.
- Kitchener, A. C.; Breitenmoser-Würsten, C.; Eizirik, E.; Gentry, A.; Werdelin, L.; Wilting, A.; Yamaguchi, N.; Abramov, A. V.; Christiansen, P.; Driscoll, C.; Duckworth, J. W.; Johnson, W.; Luo, S.-J.; Meijaard, E.; O’Donoghue, P.; Sanderson, J.; Seymour, K.; Bruford, M.; Groves, C.; Hoffmann, M.; Nowell, K.; Timmons, Z.; Tobe, S. (2017). "A revised taxonomy of the Felidae: The final report of the Cat Classification Task Force of the IUCN Cat Specialist Group" (PDF). Cat News (Special Issue 11): 66−68.
- Illiger, C. (1815). "Überblick der Säugethiere nach ihrer Verteilung über die Welttheile". Abhandlungen der Königlichen Preußischen Akademie der Wissenschaften zu Berlin. 1804−1811: 39−159.
- Heptner, V. G.; Sludskij, A. A. (1992) . "Tiger". Mlekopitajuščie Sovetskogo Soiuza. Moskva: Vysšaia Škola [Mammals of the Soviet Union. Volume II, Part 2. Carnivora (Hyaenas and Cats)]. Washington DC: Smithsonian Institution and the National Science Foundation. pp. 95–202.
- Jackson, P.; Nowell, K. (2011). "Panthera tigris ssp. virgata". IUCN Red List of Threatened Species. IUCN. 2011: e.T41505A10480967. doi:10.2305/IUCN.UK.2011-2.RLTS.T41505A10480967.en.
- Temminck, C. J. (1844). "Aperçu général et spécifique sur les Mammifères qui habitent le Japon et les Iles qui en dépendent". In Siebold, P. F. v.; Temminck, C. J.; Schlegel, H. (eds.). Fauna Japonica sive Descriptio animalium, quae in itinere per Japoniam, jussu et auspiciis superiorum, qui summum in India Batava imperium tenent, suscepto, annis 1825 - 1830 collegit, notis, observationibus et adumbrationibus illustravit Ph. Fr. de Siebold. Leiden: Lugduni Batavorum.
- Hilzheimer, M. (1905). "Über einige Tigerschädel aus der Straßburger zoologischen Sammlung". Zoologischer Anzeiger. 28: 594–599.
- Mazák, V. (1981). "Panthera tigris" (PDF). Mammalian Species. 152 (152): 1–8. doi:10.2307/3504004. JSTOR 3504004. Archived from the original (PDF) on 9 March 2012.
- Mazák, V. (1968). "Nouvelle sous-espèce de tigre provenant de l'Asie du sud-est". Mammalia. 32 (1): 104−112. doi:10.1515/mamm.19220.127.116.11.
- Luo, S.-J.; Kim, J.-H.; Johnson, W. E.; van der Walt, J.; Martenson, J.; Yuhki, N.; Miquelle, D. G.; Uphyrkina, O.; Goodrich, J. M.; Quigley, H. B.; Tilson, R.; Brady, G.; Martelli, P.; Subramaniam, V.; McDougal, C.; Hean, S.; Huang, S.-Q.; Pan, W.; Karanth, U. K.; Sunquist, M.; Smith, J. L. D.; O'Brien, S. J. (2004). "Phylogeography and genetic ancestry of tigers (Panthera tigris)". PLOS Biology. 2 (12): e442. doi:10.1371/journal.pbio.0020442. PMC 534810. PMID 15583716.
- Mazák, J. H.; Groves, C. P. (2006). "A taxonomic revision of the tigers (Panthera tigris)" (PDF). Mammalian Biology. 71 (5): 268–287. doi:10.1016/j.mambio.2006.02.007. Archived from the original (PDF) on 6 September 2007.
- Schwarz, E. (1912). "Notes on Malay tigers, with description of a new form from Bali". Annals and Magazine of Natural History. Series 8 Volume 10 (57): 324–326. doi:10.1080/00222931208693243.
- Mazak, V. (2004). Der Tiger. Westarp Wissenschaften Hohenwarsleben. ISBN 978-3-89432-759-0. (in German)
- Mazak, V.; Groves, C. P.; Van Bree, P. (1978). "Skin and Skull of the Bali Tiger, and a list of preserved specimens of Panthera tigris balica (Schwarz, 1912)". Zeitschrift für Säugetierkunde – International Journal of Mammalian Biology. 43 (2): 108–113.
- Pocock, R. I. (1929). "Tigers". Journal of the Bombay Natural History Society. 33: 505–541.
- Cracraft, J.; Feinstein, J.; Vaughn, J.; Helm-Bychowski, K. (1998). "Sorting out tigers (Panthera tigris): mitochondrial sequences, nuclear inserts, systematics, and conservation genetics" (PDF). Animal Conservation. 1 (2): 139–150. doi:10.1111/j.1469-1795.1998.tb00021.x.
- Liu, Y.-C.; Sun, X.; Driscoll, C.; Miquelle, D. G.; Xu, X.; Martelli, P.; Uphyrkina, O.; Smith, J. L. D.; O’Brien, S. J.; Luo, S.-J. (2018). "Genome-wide evolutionary analysis of natural history and adaptation in the world's tigers". Current Biology. 28 (23): 3840–3849. doi:10.1016/j.cub.2018.09.019. PMID 30482605.
- Johnson; Eizirik, E., W. E.; Pecon-Slattery, J.; Murphy, W. J.; Antunes, A.; Teeling, E.; O'Brien, S. J. (2006). "The Late Miocene radiation of modern Felidae: A genetic assessment". Science. 311 (5757): 73–77. Bibcode:2006Sci...311...73J. doi:10.1126/science.1122277. PMID 16400146.
- Davis, B. W.; Li, G.; Murphy, W. J. (2010). "Supermatrix and species tree methods resolve phylogenetic relationships within the big cats, Panthera (Carnivora: Felidae)". Molecular Phylogenetics and Evolution. 56 (1): 64–76. doi:10.1016/j.ympev.2010.01.036. PMID 20138224.
- Tseng, Z. J.; Wang, X.; Slater, G. J.; Takeuchi, G. T.; Li, Q.; Liu, J.; Xie, G. (2014). "Himalayan fossils of the oldest known pantherine establish ancient origin of big cats". Proceedings of the Royal Society B: Biological Sciences. 281 (1774): 20132686. doi:10.1098/rspb.2013.2686. PMC 3843846. PMID 24225466.
- Mazák, J. H.; Christiansen, P.; Kitchener, A. C. (2011). "Oldest Known Pantherine Skull and Evolution of the Tiger". PLoS ONE. 6 (10): e25483. Bibcode:2011PLoSO...625483M. doi:10.1371/journal.pone.0025483. PMC 3189913. PMID 22016768.
- Hemmer, H. (1971). "Fossil mammals of Java. II. Zur Fossilgeschichte des Tigers (Panthera tigris (L.)) in Java". Koninklijke Nederlandse Akademie van Wetenschappen. B. 74 (1): 35–52.
- Hasegawa, Y.; Tomida, Y.; Kohno, N.; Ono, K.; Nokariya, H.; Uyeno, T. (1988). "Quaternary vertebrates from Shiriya area, Shimokita Pininsula, northeastern Japan". Memoirs of the National Science Museum. 21: 17–36.
- Turner, A.; Antón, M. (1997). The Big Cats and Their Fossil Relatives: An Illustrated Guide to Their Evolution and Natural History. Columbia University Press. ISBN 978-0-231-10228-5.
- Piper, P. J.; Ochoa, J.; Lewis, H.; Paz, V.; Ronquillo, W. P. (2008). "The first evidence for the past presence of the tiger Panthera tigris (L.) on the island of Palawan, Philippines: extinction in an island population". Palaeogeography, Palaeoclimatology, Palaeoecology. 264 (1–2): 123–127. Bibcode:2008PPP...264..123P. doi:10.1016/j.palaeo.2008.04.003.
- Van der Geer, A.; Lyras, G.; De Vos, J.; Dermitzakis, M. (2011). "15 (The Philippines); 26 (Carnivores)". Evolution of Island Mammals: Adaptation and Extinction of Placental Mammals on Islands. John Wiley & Sons. pp. 220–347.
- Ochoa, J.; Piper, P. J. (2017). "Tiger". In Monks, G. (ed.). Climate Change and Human Responses: A Zooarchaeological Perspective. Springer. pp. 79–80. ISBN 978-9-4024-1106-5.
- Kitchener, A.; Yamaguchi, N. (2010). "What is a Tiger? Biogeography, Morphology, and Taxonomy". In Tilson, R.; Nyhus, P. J. (eds.). Tigers of the World: The Science, Politics and Conservation of Panthera tigris (Second ed.). London, Burlington: Academic Press. pp. 53–84. ISBN 978-0-08-094751-8.
- Piper, P. J.; Rabett, R. J. (2007). "Confirmation of the presence of the tiger Panthera tigris (L.) in Late Pleistocene and Holocene Borneo". Malayan Nature Journal. 59 (3): 259–267. Retrieved 29 May 2018.
- Cooper, D. M.; Dugmore, A. J.; Gittings, B. M.; Scharf, A. K.; Wilting, A.; Kitchener, A. C. (2016). "Predicted Pleistocene–Holocene rangeshifts of the tiger (Panthera tigris)". Diversity and Distributions. 22 (11): 1–13. doi:10.1111/ddi.12484.
- Cho, Y. S.; Hu, L.; Hou, H.; Lee, H.; Xu, J.; Kwon, S.; Oh, S.; Kim, H. M.; Jho, S.; Kim, S.; Shin, Y. A.; Kim, B. C.; Kim, H.; Kim, C. U.; Luo, S. J.; Johnson, W. E.; Koepfli, K. P.; Schmidt-Küntzel, A.; Turner, J. A.; Marker, L.; Harper, C.; Miller, S. M.; Jacobs, W.; Bertola, L. D.; Kim, T. H.; Lee, S.; Zhou, Q.; Jung, H. J.; Xu, X.; Gadhvi, P.; et al. (2013). "The tiger genome and comparative analysis with lion and snow leopard genomes". Nature Communications. 4: 2433. Bibcode:2013NatCo...4.2433C. doi:10.1038/ncomms3433. PMC 3778509. PMID 24045858.
- Actman, Jani (24 February 2017). "Cat Experts: Ligers and Other Designer Hybrids Pointless and Unethical". National Geographic.com. Retrieved 27 August 2018.
- Markel, S.; León, D. (2003). Sequence Analysis in a Nutshell: a guide to common tools and databases (PDF). Sebastopol, California: O'Reily. ISBN 978-0-596-00494-1. Archived from the original (PDF) on 27 August 2018. Retrieved 26 August 2018.
- "Genomic Imprinting". Genetic Science Learning Center, Utah.org. Retrieved 26 August 2018.
- Singh, A. (1985). "Okapis and litigons in London and Calcutta". New Scientist (1453): 7.
- Guggisberg, C. A. W. (1975). "Tiger Panthera tigris (Linnaeus, 1758)". Wild Cats of the World. New York: Taplinger Pub. Co. pp. 180–215. ISBN 978-0-7950-0128-4.
- Miquelle, D. (2001). "Tiger". In MacDonald, D. (ed.). The Encyclopedia of Mammals (2nd ed.). Oxford University Press. pp. 18–21. ISBN 978-0-7607-1969-5.
- Godfrey, D.; Lythgoe, J. N.; Rumball, D. A. (1987). "Zebra stripes and tiger stripes: the spatial frequency distribution of the pattern compared to that of the background is significant in display and crypsis". Biological Journal of the Linnean Society. 32 (4): 427–433. doi:10.1111/j.1095-8312.1987.tb00442.x.
- Allen, W. L.; Cuthill, I. C.; Scott-Samuel, N. E.; Baddeley, R. (2010). "Why the leopard got its spots: relating pattern development to ecology in felids". Proceedings of the Royal Society B. 278 (1710): 1373–1380. doi:10.1098/rspb.2010.1734. PMC 3061134. PMID 20961899.
- Langley, L. (2017). "Do Zebras Have Stripes On Their Skin?". National Geographic.
- Leyhausen, P. (1979). Cat behavior: the predatory and social behavior of domestic and wild cats. Berlin: Garland Publishing, Incorporated. p. 281. ISBN 9780824070175.
- Matthiessen, P.; Hornocker, M. (2008). Tigers In The Snow (reprint ed.). Paw Prints. ISBN 9781435296152.
- McNab, B. K. (1971). "On the ecological significance of Bergman'rule". Ecology. 52 (5): 845–854. doi:10.2307/1936032. JSTOR 1936032.
- Robinson, R. (1969). "The white tigers of Rewa and gene homology in the Felidae". Genetica. 40 (1): 198−200. doi:10.1007/BF01787350.
- Xu, X.; Dong, G. X.; Schmidt-Küntzel, A.; Zhang, X. L.; Zhuang, Y.; Fang, R.; Sun, X.; Hu, X.S.; Zhang, T. Y.; Yang, H. D.; Zhang, D. L.; Marker, L.; Jiang, Z.-F.; Li, R.; Luo, S.-J. (2017). "The genetics of tiger pelage color variations" (PDF). Cell Research. 27 (7): 954–957. doi:10.1038/cr.2017.32. PMC 5518981. PMID 28281538.
- Xu, X.; Dong, G. X.; Hu, X. S.; Miao, L.; Zhang, X. L.; Zhang, D. L.; Yang, H. D.; Zhang, T. Y.; Zou, Z. T.; Zhang, T. T.; Zhuang, Y.; Bhak, J.; Cho, Y. S.; Dai, W. T.; Jiang, T. J.; Xie, C.; Li, R.; Luo, S. J. (2013). "The Genetic Basis of White Tigers". Current Biology. 23 (11): 1031–5. doi:10.1016/j.cub.2013.04.054. PMID 23707431.
- Gee, E. P. (1959). "Albinism and Partial Albinism in Tigers". The Journal of the Bombay Natural History Society. 56: 581−587.
- Guillery, R. W.; Kaas, J. H. (1973). "Genetic abnormality of the visual pathways in a "white" tiger". Science. 180 (4092): 1287−1289. Bibcode:1973Sci...180.1287G. doi:10.1126/science.180.4092.1287. PMID 4707916.
- Begany, L.; Criscuolo, C. L. (2009). "Accumulation of Deleterious Mutations Due to Inbreeding in Tiger Population" (PDF). Archived from the original (PDF) on 10 May 2015.
- Xavier, N. (2010). "A new conservation policy needed for reintroduction of Bengal tiger-white". Current Science. 99 (7): 894–895.
- Seidensticker, J. (1986). "Large Carnivores and the Consequences of Habitat Insularization: ecology and conservation of Tigers in Indonesia and Bangladesh" (PDF). In Miller, S. D.; Everett, D. D. (eds.). Cats of the world: biology, conservation and management. Washington DC: National Wildlife Federation. pp. 1−41.
- Miquelle, D. G.; Smirnov, E. N.; Merrill, T. W.; Myslenkov, A. E.; Quigley, H.; Hornocker, M. G.; Schleyer, B. (1999). "Hierarchical spatial analysis of Amur tiger relationships to habitat and prey". In Seidensticker, J.; Christie, S.; Jackson, P. (eds.). Riding the Tiger. Tiger Conservation in Human-dominated Landscapes. London: Cambridge University Press. pp. 71–99. ISBN 978-0521648356.
- Sanderson, E.; Forrest, J.; Loucks, C.; Ginsberg, J.; Dinerstein, E.; Seidensticker, J.; Leimgruber, P.; Songer, M.; Heydlauff, A.; O'Brien, T.; Bryja, G.; Klenzendorf, S.; Wikramanayake, E. (2006). "The Technical Assessment: Setting Priorities for the Conservation and Recovery of Wild Tigers: 2005–2015" (PDF). WCS, WWF, Smithsonian, and NFWFe. Archived from the original (PDF) on 18 January 2012. Retrieved 7 August 2019. Cite journal requires
- Sunquist, M. (2010). "What is a Tiger? Ecology and Behaviour". In R. Tilson; P. J. Nyhus (eds.). Tigers of the World: The Science, Politics and Conservation of Panthera tigris (Second ed.). London, Burlington: Academic Press. p. 19−34. ISBN 978-0-08-094751-8.
- Karanth, K. U.; Sunquist, M. E.; Chinnappa, K. M. (1999). "Long-term monitoring of tigers: lessons from Nagarahole". In Seidensticker, J.; Christie, S.; Jackson, P. (eds.). Riding the Tiger. Tiger Conservation in Human-dominated Landscapes. London: Cambridge University Press. pp. 114–122. ISBN 978-0521648356.
- Wibisono, H. T.; Linkie, M.; Guillera-Arroita, G.; Smith, J. A.; Sunarto; Pusarini, W.; Asriadi; Baroto, P.; Brickle, N.; Dinata, Y.; Gemita, E.; Gunaryadi, D.; Haidir, I. A.; Herwansyah (2011). "Population Status of a Cryptic Top Predator: An Island-Wide Assessment of Tigers in Sumatran Rainforests". PLOS ONE. 6 (11): e25931. Bibcode:2011PLoSO...625931W. doi:10.1371/journal.pone.0025931. PMC 3206793. PMID 22087218.
- Kerley, L. L.; Goodrich, J. M.; Miquelle, D. G.; Smirnov, E. N.; Quigley, H. G.; Hornocker, M. G. (2003). "Reproductive parameters of wild female Amur (Siberian) tigers (Panthera tigris altaica)". Journal of Mammalogy. 84 (1): 288–298. doi:10.1644/1545-1542(2003)084<0288:RPOWFA>2.0.CO;2. JSTOR 1383657.
- Faizolahi, K. (2016). "Tiger in Iran – historical distribution, extinction causes and feasibility of reintroduction". Cat News (Special Issue 10): 5–13.
- Thapar, V. (1994). The Tiger's Destiny. London: Kyle Cathie. pp. 47, 174–175. ISBN 978-1-85626-142-5.
- Sunquist, M.; Sunquist, F. (1991). "Tigers". In Seidensticker, J.; Lumpkin, S. (eds.). Great Cats. Fog City Press. pp. 97–98. ISBN 978-1-875137-90-9.
- Novak, R. M.; Walker, E. P. (1999). "Panthera tigris (tiger)". Walker's Mammals of the World (6th ed.). Baltimore: Johns Hopkins University Press. pp. 825–828. ISBN 978-0-8018-5789-8.
- Joshi, A.; Vaidyanathan, S.; Mondol, S.; Edgaonkar, A.; Ramakrishnan, U. (2013). "Connectivity of Tiger (Panthera tigris) Populations in the Human-Influenced Forest Mosaic of Central India". PLoS ONE. 8 (11): e77980. Bibcode:2013PLoSO...877980J. doi:10.1371/journal.pone.0077980. PMC 3819329. PMID 24223132.
- Smith, J. L. D. (1993). "The role of dispersal in structuring the Chitwan tiger population". Behaviour. 124 (3): 165–195. doi:10.1163/156853993X00560.
- McDougal, Charles (1977). The Face of the Tiger. London: Rivington Books and André Deutsch. pp. 63–76.
- Mills, S. (2004). Tiger. London: BBC Books. p. 89. ISBN 978-1-55297-949-5.
- Burger, B. V.; Viviers, M. Z.; Bekker, J. P. I.; Roux, M.; Fish, N.; Fourie, W. B.; Weibchen, G. (2008). "Chemical Characterization of Territorial Marking Fluid of Male Bengal Tiger, Panthera tigris" (PDF). Journal of Chemical Ecology. 34 (5): 659–671. doi:10.1007/s10886-008-9462-y. hdl:10019.1/11220. PMID 18437496.
- Smith, J. L. David; McDougal, C.; Miquelle, D. (1989). "Scent marking in free-ranging tigers, Panthera tigris" (PDF). Animal Behaviour. 37: 1–10. doi:10.1016/0003-3472(89)90001-8.[permanent dead link]
- Schaller, G. (1967). The Deer and the Tiger: A Study of Wildlife in India. Chicago: Chicago Press.
- Wildlife Conservation Society. (2015). Tiger dad: Rare family portrait of Amur tigers the first-ever to include an adult male. ScienceDaily, 6 March 2015.
- "T-25 Dollar Dominant Male Tiger in Ranthambore National Park".
- Thapar, V. (1989). Tiger: Portrait of a Predator. New York: Smithmark. ISBN 978-0-8160-1238-1.
- Peters, G.; Tonkin-Leyhausen, B. A. (1999). "Evolution of Acoustic Communication Signals of Mammals: Friendly Close-Range Vocalizations in Felidae (Carnivora)". Journal of Mammalian Evolution. 6 (2): 129–159. doi:10.1023/A:1020620121416.
- Hayward, M. W.; Jędrzejewski, W.; Jędrzejewska, B. (2012). "Prey preferences of the tiger Panthera tigris". Journal of Zoology. 286 (3): 221–231. doi:10.1111/j.1469-7998.2011.00871.x.
- Ramesh, T.; Snehalatha, V.; Sankar, K. & Qureshi, Q. (2009). "Food habits and prey selection of tiger and leopard in Mudumalai Tiger Reserve, Tamil Nadu, India". Journal of Scientific Transactions in Environment and Technovation. 2 (3): 170–181. doi:10.20894/stet.116.002.003.010.
- Perry, Richard (1965). The World of the Tiger. p. 260.
- "Trouble for rhino from poacher and Bengal tiger". The Telegraph. 2008. Archived from the original on 27 September 2014. Retrieved 3 June 2014.
- "Tiger kills elephant at Eravikulam park". The New Indian Express. 2009.
- "Tiger kills adult rhino in Dudhwa Tiger Reserve". The Hindu. 29 January 2013 – via www.thehindu.com.
- Karanth, K. U. & Nichols, J. D. (1998). "Estimation of tiger densities in India using photographic captures and recaptures" (PDF). Ecology. 79 (8): 2852–2862. doi:10.1890/0012-9658(1998)079[2852:EOTDII]2.0.CO;2. JSTOR 176521.
- BBC (2008). Tiger: Spy In The Jungle. John Downer Productions
- Sankhala, p. 17
- Hunter, Luke (2011). Carnivores of the World. Princeton University Press. ISBN 978-0-691-15228-8.
- Sunquist, M.; Sunquist, F. (2002). "Tiger Panthera tigris (Linnaeus, 1758)". Wild Cats of the World. Chicago: University Of Chicago Press. pp. 343–372. ISBN 978-0-22-677999-7.
- Sankhala, p. 23
- Mills, Stephen (2004). Tiger. Richmond Hill, Ontario.: Firefly Books. p. 168. ISBN 978-1-55297-949-5.
- "Tiger". Oaklandzoo.org. Archived from the original on 25 October 2010. Retrieved 7 March 2009.
- Sunquist, Fiona & Sunquist, Mel (2002). Tiger Moon. University of Chicago Press. ISBN 978-0-226-77997-3.
- Mills, Gus; Hofer, Heribert (1998). Hyaenas: status survey and conservation action plan. IUCN/SSC Hyena Specialist Group. ISBN 2-8317-0442-1.
- Miquelle, D.G., Stephens, P.A., Smirnov, E.N., Goodrich, J.M., Zaumyslova, O.Yu. & Myslenkov, A.I. (2005). Tigers and Wolves in the Russian Far East: Competitive Exclusion, Functional Redundancy and Conservation Implications. In Large Carnivores and the Conservation of Biodiversity. Ray, J.C., Berger, J., Redford, K.H. & Steneck, R. (eds.) New York: Island Press. pp. 179–207 ISBN 1-55963-080-9.
- Goldsmith, O. (2010). A History Of The Earth, And Animated Nature, Volume 2. Nabu Press. p. 297. ISBN 978-1-145-11108-0.
- Mills, Stephen (2004). Tiger. Richmond Hill, Ont.: Firefly Books. p. 168. ISBN 978-1-55297-949-5.
- "Sympatric Tiger and Leopard: How two big cats coexist in the same area". Archived from the original on 13 February 2008. Ecology.info
- Karanth, K. Ullas; Sunquist, Melvin E. (2000). "Behavioural correlates of predation by tiger (Panthera tigris), leopard (Panthera pardus) and dhole (Cuon alpinus) in Nagarahole, India". Journal of Zoology. 250 (2): 255–265. doi:10.1111/j.1469-7998.2000.tb01076.x.
- Karanth, K. U. & Sunquist, M. E. (1995). "Prey Selection by Tiger, Leopard and Dhole in Tropical Forests". Journal of Animal Ecology. 64 (4): 439–450. doi:10.2307/5647. JSTOR 5647.
- Sillero-Zubiri, C., Hoffmann, M. and Macdonald, D.W. (eds). 2004. Canids: Foxes, Wolves, Jackals and Dogs. Status Survey and Conservation Action Plan. IUCN/SSC Canid Specialist Group. Gland, Switzerland and Cambridge, UK. ISBN 2-8317-0786-2
- Thinley, P.; et al. (2018). "The ecological benefit of tigers (Panthera tigris) to farmers in reducing crop and livestock losses in the eastern Himalayas: Implications for conservation of large apex predators". Biological Conservation. 219: 119–125. doi:10.1016/j.biocon.2018.08.007.
- Sankhala, K. S. (1967). "Breeding behaviour of the tiger Panthera tigris in Rajasthan". International Zoo Yearbook. 7 (1): 133−147. doi:10.1111/j.1748-1090.1967.tb00354.x.
- Pacifici, M.; Santini, L.; Di Marco, M.; Baisero, D.; Francucci, L.; Grottolo Marasini, G.; Visconti, P.; Rondinini, C. (2013). "Generation length for mammals". Nature Conservation (5): 87–94.
- "Country's tiger population up by 750 in 4 yrs to 2,976: Prakash Javadekar". The Times of India. 2 December 2019.
- Global Tiger Forum (2016). "Global wild tiger population status, April 2016" (PDF). Global Tiger Forum, WWF.
- Wang, T.; Feng, L.; Mou, P.; Wu, J.; Smith, J.L.; Xiao, W.; Yang, H.; Dou, H.; Zhao, X.; Cheng, Y.; Zhou, B. (2016). "Amur tigers and leopards returning to China: direct evidence and a landscape conservation plan". Landscape Ecology. 31 (3): 491−503. doi:10.1007/s10980-015-0278-1.
- Aziz, M. A.; Tollington, S.; Barlow, A.; Greenwood, C.; Goodrich, J. M.; Smith, O.; Shamsuddoha, M.; Islam, M. A.; Groombridge, J. J. (2017). "Using non-invasively collected genetic data to estimate density and population size of tigers in the Bangladesh Sundarbans". Global Ecology and Conservation. 12: 272–282. doi:10.1016/j.gecco.2017.09.002.
- Wikramanayake, E. D.; Dinerstein, E.; Robinson, J. G.; Karanth, K. U.; Rabinowitz, A.; Olson, D.; Mathew, T.; Hedao, P.; Connor, M.; Hemley, G.; Bolze, D. (1999). "Where can tigers live in the future? A framework for identifying high-priority areas for the conservation of tigers in the wild". In Seidensticker, J.; Christie, S.; Jackson, P. (eds.). Riding the Tiger: Tiger Conservation in Human Dominated Landscape. London: Cambridge University Press. pp. 254–272. ISBN 978-0521648356.
- Howard, B. C. (2016). "Tiger Numbers Rise for First Time in a Century". National Geographic.
- Daigle, K. (2016). "World's wild tiger count rising for first time in a century". Phys Org. Retrieved 17 April 2016.
- Sanderson, E. W.; Forrest, J.; Loucks, C.; Ginsberg, J.; Dinerstein, E.; Seidensticker, J.; Leimgruber, P.; Songer, M.; Heydlauff, A.; O'Brien, T.; Bryja, G.; Klenzendorf, S.; Wikramanayake, E. (2010). "Setting Priorities for the Conservation and Recovery of Wild Tigers: 2005–2015" (PDF). In Tilson, R.; Nyhus, P. J. (eds.). Tigers of the World: The Science, Politics and Conservation of Panthera tigris (Second ed.). London, Burlington: Academic Press. pp. 143–161. ISBN 978-0-08-094751-8.
- "Traditional Chinese Medicine". World Wildlife Foundation. Archived from the original on 11 May 2012. Retrieved 3 March 2012.
- Jacobs, Andrew (13 February 2010). "Tiger Farms in China Feed Thirst for Parts". New York Times.
- "Tiger". Big Cat Rescue. Retrieved 7 March 2009.
- "Tigers 'take night shift' to dodge humans". BBC News. 4 September 2012. Retrieved 10 April 2014.
- WWF – Tiger – Overview. Worldwildlife.org (10 August 2011). Retrieved on 27 September 2011.
- Plumer, Brad (11 April 2016). "Wild tiger populations are rebounding for the first time in a century". Vox. Retrieved 11 April 2016.
- Burke, Jason (20 January 2015). "India's tiger population increases by almost a third". The Guardian. Retrieved 3 May 2015.
- "International Tiger Day 2019: PM Modi Releases Report, India counts 2967 Tigers". Jagran Josh. 29 July 2019.
- "Front Page : Over half of tigers lost in 5 years: census". The Hindu. 13 February 2008. Retrieved 10 June 2010.
- Foster, Peter (30 August 2007). "Why the tiger's future is far from bright". The Telegraph. Retrieved 19 September 2018.
- "Tiger Reserves". ENVIS Centre on Wildlife & Protected Areas. Retrieved 19 September 2018.
- Page, Jeremy (5 July 2008). "Tigers flown by helicopter to Sariska reserve to lift numbers in western India". The Times. London. Retrieved 25 May 2010.
- "India Reports Sharp Decline in Wild Tigers". News.nationalgeographic.com. Retrieved 10 June 2010.
- "It's the tale of a tiger, two tigresses in wilds of Sariska". Economictimes.indiatimes.com. 2 March 2009. Retrieved 10 June 2010.
- "Tigers galore in Ranthambhore National Park". Hindu.com. 11 March 2009. Retrieved 10 June 2010.
- Goodrich, J.M.; Miquelle, D.G.; Smirnov, E.M.; Kerley, L.L.; Quigley, H.B.; Hornocker, M.G. (2010). "Spatial structure of Amur (Siberian) tigers (Panthera tigris altaica) on Sikhote-Alin Biosphere Zapovednik, Russia". Journal of Mammalogy. 91 (3): 737–748. doi:10.1644/09-mamm-a-293.1.
- "Amur (Siberian) tiger". World Wildlife Fund. Archived from the original on 25 November 2013. Retrieved 19 December 2007.
- Timothy, E.; Fulbright, D.; Hewitt, G. (2007). Wildlife Science: Linking Ecological Theory and Management Applications. CRC Press. ISBN 978-0-8493-7487-6.
- Miquelle, D.; Darman, Y.; Seryodkin, I. (2011). "Panthera tigris ssp. altaica". IUCN Red List of Threatened Species. IUCN. 2011: e.T15956A5333650. doi:10.2305/IUCN.UK.2011-2.RLTS.T15956A5333650.en.
- Tilson, R.; Defu, H.; Muntifering, J.; Nyhus, P. J. (2004). "Dramatic decline of wild South China tigers Panthera tigris amoyensis: field survey of priority tiger reserves". Oryx. 38 (1): 40–47. doi:10.1017/S0030605304000079.
- Nyhus, P. (2008). "Panthera tigris ssp. amoyensis". IUCN Red List of Threatened Species. IUCN. 2008: e.T15965A5334628. doi:10.2305/IUCN.UK.2008.RLTS.T15965A5334628.en.
- Wang, T.M.; Yang, H.T.; Xiao, W.H.; Feng, L.M.; Mou, P.; Ge, J. P. (2014). "Camera traps reveal Amur tiger breeding in NE China". Cat News (61): 18−19.
- Xiao, W.; Feng, L.; Mou, P.; Miquelle, D.G.; Hebblewhite, M.; Goldberg, J.F.; Robinson, H.S.; Zhao, X.; Zhou, B.; Wang, T.; Ge, J. (2016). "Estimating abundance and density of Amur tigers along the Sino–Russian border". Integrative Zoology. 11 (4): 322−332. doi:10.1111/1749-4877.12210. PMID 27136188.
- Yeh, Emily T. (2012). "Transnational Environmentalism and Entanglements of Sovereignty: The Tiger Campaign Across the Himalayas". Political Geography. 31 (7): 408–418. doi:10.1016/j.polgeo.2012.06.003.
- "Animal Skin Clothes Burned In Tibet After Dalai Lamas Call". The Office of His Holiness the Dalai Lama. 17 February 2006. Archived from the original on 30 October 2010. Retrieved 4 December 2010.
- Franklin, N., Bastoni, Sriyanto, Siswomartono, D., Manansang, J. and R. Tilson (1999). Last of the Indonesian tigers: a cause for optimism, pp. 130–147 in: Seidensticker, J., Christie, S. and Jackson, P. (eds). Riding the tiger: tiger conservation in human-dominated landscapes. Cambridge University Press, Cambridge, ISBN 0-521-64835-1.
- Tilson, R. (1999). Sumatran Tiger Project Report No. 17 & 18: July − December 1999. Grant number 1998-0093-059. Indonesian Sumatran Tiger Steering Committee, Jakarta.
- Nyhus, P., Sumianto and R. Tilson (1999). The tiger-human dimension in southeast Sumatra, pp. 144–145 in: Seidensticker, J., Christie, S. and Jackson, P. (eds). Riding the tiger: tiger conservation in human-dominated landscapes. Cambridge University Press, Cambridge, ISBN 0-521-64835-1.
- Rabinowitz, A. (2009). "Stop the bleeding: implementing a strategic Tiger Conservation Protocol" (PDF). Cat News (51): 30–31. ISSN 1027-2992. Archived from the original (PDF) on 9 November 2012.
- Karanth, K.U.; Nichols, J.D.; Seidensticker, J.; Dinerstein, E.; Smith, J.L.D.; McDougal, C.; Johnsingh, A.J.T.; Chundawat, R.S. (2003). "Science deficiency in conservation practice: the monitoring of tiger populations in India" (PDF). Animal Conservation. 6 (2): 141–146. doi:10.1017/S1367943003003184.
- Gopalaswamy, A. M.; Royle, J. A.; Delampady, M.; Nichols, J. D.; Karanth, K. U.; Macdonald, D. W. (2012). "Density estimation in tiger populations: combining information for strong inference". Ecology. 93 (7): 1741–1751. doi:10.1890/11-2110.1. JSTOR 23225238.
- Caragiulo, A.; Pickles, R. S. A.; Smith, J. A.; Smith, O.; Goodrich, J.; Amato, G. (2015). "Tiger (Panthera tigris) scent DNA: a valuable conservation tool for individual identification and population monitoring". Conservation Genetics Resources. 7 (3): 681–683. doi:10.1007/s12686-015-0476-9.
- Royal Tiger (nom-de-plume) in The Manpoora Tiger – about a Tiger Hunt in Rajpootanah. (1836) Bengal Sporting Magazine, Vol IV. reproduced in The Treasures of Indian Wildlife
- Harding, Andrew (23 September 2006). "Beijing's penis emporium". BBC News. Retrieved 7 March 2009.
- Nowell, K. (2007). "Asian big cat conservation and trade control in selected range States: evaluating implementation and effectiveness of CITES Recommendations" (PDF). TRAFFIC International. Retrieved 3 April 2014.
- "Chinese tiger farms must be investigated". WWF. 24 April 2007. Archived from the original on 5 July 2007. Retrieved 7 March 2009.
- "WWF: Breeding tigers for trade soundly rejected at CITES". Panda.org. 13 June 2007. Archived from the original on 17 March 2008. Retrieved 7 March 2009.
- Jackson, Patrick (29 January 2010). "Tigers and other farmyard animals". BBC News. Retrieved 29 January 2010.
- "Conservationists shocked by Chinese admission of tiger skin selling". Shanghai Sun. Archived from the original on 14 July 2014. Retrieved 12 July 2014.
- Singh, Kesri (1959). The tiger of Rajasthan. Hale.
- Byrne, Peter (2002). Shikari Sahib. Pilgrims Publishing. pp. 291–292. ISBN 978-81-7769-183-2.
- Wood, G. (1983). The Guinness Book of Animal Facts and Feats. Guinness Superlatives. ISBN 978-0-85112-235-9.
- Corbett, J. (1944). Man-Eaters of Kumaon. Bombay: Oxford University Press.
- The Man-Eater of Segur", from Nine Man-Eaters and One Rogue, Kenneth Anderson, Allen & Unwin, 1954
- "Famous 'man-eater' at Calcutta". Underwood & Underwood. 1903. Retrieved 9 April 2014.
- "Climate change linked to Indian tiger attacks". Environmental News Network. 20 October 2008. Retrieved 27 October 2008.
- Montgomery, Sy (2009). Spell of the Tiger: The Man-Eaters of Sundarbans. Chelsea Green Publishing. pp. 37–38. ISBN 978-0-395-64169-9.
- Auguet, Roland (1994). Cruelty and civilization: the Roman games. Psychology Press. pp. 83–85. ISBN 978-0-415-10453-1.
- Baker, William (1988). Sports in the Western World. University of Illinois Press. p. 33. ISBN 978-0-252-06042-7.
- Baratay, Eric (2004). Zoo: A History of Zoological Gardens in the West. Reaktion Books. p. 19. ISBN 978-1-86189-208-9.
- Baratay, Eric (2004). Zoo: A History of Zoological Gardens in the West. Reaktion Books. p. 122. ISBN 978-1-86189-208-9.
- Ruppel, Louis (1951). "Collier's, Volume 127". Crowell-Collier Publishing Company: 61. Cite journal requires
- Nowell, K., Ling, X. (2007) Taming the tiger trade: China's markets for wild and captive tiger products since the 1993 domestic trade ban. TRAFFIC East Asia, Hong Kong, China.
- Wildlife Watch, Group (2011). "Less than 3,000 Pet Tigers in America". Wildlife Times. 5 (37): 12–13.
- "Summary of State Laws Relating to Private Possession of Exotic Animals". Born Free USA. Retrieved 12 December 2010.
- Luo, S.; Johnson, W. E.; Martenson, J.; Antunes, A.; Martelli, P.; Uphyrkina, O.; Traylor-Holzer, K.; Smith, J. L.D.; O'Brien, S. J. (2008). "Subspecies Genetic Assignments of Worldwide Captive Tigers Increase Conservation Value of Captive Populations" (PDF). Current Biology. 18 (8): 592–596. doi:10.1016/j.cub.2008.03.053. PMID 18424146. Archived from the original (PDF) on 25 April 2012.
- Sanderson, James; Moulton, Michael (18 August 1998). Wildlife Issues in a Changing World (Second ed.). CRC Press. p. 133. ISBN 978-1-4398-3262-2.
- "Endangered tiger earns its stripes as the world's most popular beast". The Independent. 6 December 2004. Archived from the original on 20 January 2008. Retrieved 7 March 2009.
- Cooper, J. C. (1992). Symbolic and Mythological Animals. London: Aquarian Press. pp. 161–62. ISBN 978-1-85538-118-6.
- "Tiger's Tail". Cultural China. Archived from the original on 29 March 2014. Retrieved 29 March 2014.
- Chan-eung, Par (1999). A Tiger by the tail and other Stories from the heart of Korea. Libraries Unlimited.
- Standard Korean Language Dictionary
- Sivkishen (2014). Kingdom of Shiva. New Delhi: Diamond Pocket Books Pvt Ltd. p. 301.
- Balambal, V. (1997). "19. Religion – Identity – Human Values – Indian Context". Bioethics in India: Proceedings of the International Bioethics Workshop in Madras: Biomanagement of Biogeoresources, 16–19 January 1997. Eubios Ethics Institute. Retrieved 8 October 2007.
- Dunbabin, Katherine, M. D. (1999). Mosaics of the Greek and Roman World. Cambridge: Cambridge University Press. p. 32, 44. ISBN 978-0-521-00230-1.
- Summers, M. (1933). The Werewolf in Lore and Legend (2012 ed.). Mineola: Dover Publications. p. 21. ISBN 978-0-517-18093-8.
- Newman, Patrick (2012). Tracking the Weretiger: Supernatural Man-Eaters of India, China and Southeast Asia. McFarland. pp. 96–102. ISBN 978-0-7864-7218-5.
- Krishna-Dwaipayana Vyasa. "SECTION LXVIII". The Mahabharata. Translated by Ganguli, K. M. Retrieved 15 June 2016 – via Internet Sacred Text Archive.
- Green, S. (2006). Tiger. Reaktion Books. pp. 72–73, 125–27. ISBN 978-1861892768.
- Castelli, Jean-Christopher (2012). The Making of Life of Pi: A Film, a Journey. Harper Collins. ISBN 978-0062114136.
- Booth, Martin (1991) Carpet Sahib; A Life of Jim Corbett, New York: Oxford University Press, ISBN 0-19-282859-2, p. 230.
- Kuznets, L. R. (1994). When Toys Come Alive: Narratives of Animation, Metamorphosis, and Development. Yale University Press. p. 54. ISBN 978-0300056457.
- Gifford, C. (2005). Advertising & Marketing: Developing the Marketplace. Heinemann-Raintree Library. pp. 34–35. ISBN 978-1403476517.
- "The history of advertising in quite a few objects: 43 Esso tiger tails". Campaign. 27 September 2012. Retrieved 29 March 2014.
- Hermann Kulke, K Kesavapany, Vijay Sakhuja (2009) Nagapattinam to Suvarnadwipa: Reflections on the Chola Naval Expeditions to Southeast Asia, Institute of Southeast Asian Studies, p. 84.
- Singh, U. (2008). A History of Ancient and Early Medieval India: From the Stone Age to the 12th Century. Pearson Education, India.
- Daya Somasundaram (11 February 2014) Scarred Communities: Psychosocial Impact of Man-made and Natural Disasters on Sri Lankan Society, SAGE Publications India, p. 73.
- "National Animal". Government of India Official website. Archived from the original on 11 May 2012.
- DiPiazza, F. (2006). Malaysia in Pictures. Twenty-First Century Books. p. 14. ISBN 978-0-8225-2674-2.
- Arthur Fox-Davies, A Complete Guide to Heraldry, T.C. and E.C. Jack, London, 1909, 191-192, https://archive.org/details/completeguidetoh00foxduoft.
- Porter, J. H. (1894). "The Tiger". Wild beasts: a study of the characters and habits of the elephant, lion, leopard, panther, jaguar, tiger, puma, wolf, and grizzly bear. New York: C. Scribner's sons. pp. 196–256.
- Sankhala, K. (1997). Indian Tiger. New Delhi: Roli Books Pvt Limited. ISBN 978-81-7437-088-4.
- Schnitzler, A.; Hermann, L. (2019). "Chronological distribution of the tiger Panthera tigris and the Asiatic lion Panthera leo persica in their common range in Asia". Mammal Review. 49 (4): 340–353. doi:10.1111/mam.12166.
|Wikiquote has quotations related to: Tigers|
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|Wikispecies has information related to Panthera tigris|
- Species portrait Tiger; IUCN/SSC Cat Specialist Group
- Biodiversity Heritage Library bibliography for Panthera tigris
- Tiger Stamps: Tiger images on postage stamps from many different countries
- Year of the tiger. Video collection on occasion of the Year of the Tiger, 2010. BBC.
- Video clips. BBC archive on Wildlife Finder.
- "Is this the last chance to save the tiger?". 19 November 2010. Pralad Yonzon. The Kathmandu Post.
- Marshall, A. (26 February 2010). "Tale of the Cat". Time. Archived from the original on 26 February 2010.
- Mohan, V. "India's tiger population increases by 30% in past three years; country now has 2,226 tigers". The Times of India.