Bengal Tiger (P. tigris tigris)
Historical distribution of tigers (pale yellow) and 2006 (green) (NFWF 2007).
Tigris striatus Severtzov, 1858
The tiger (Panthera tigris) is a mammal of the Felidae family and one of the four species of "big cats" (subfamily Pantherinae) in the Panthera genus, along with the lion (Panthera leo), jaguar (Panthera onca), and leopard (Panthera pardus).
Native to the mainland of southeastern Asia, the tiger is an apex predator and the largest surviving feline species in the world. The critical endangered Siberian tiger (Panthera tigris altaica), confined to small parts of Russia, China, and Korea, is the largest subspecies of tiger. The Bengal tiger (P. tigris tigris) is the most common subspecies of tiger, constituting approximately 80 percent of the entire tiger population, and is found in India, Bangladesh, Bhutan, Myanmar, and Nepal.
The tiger is solitary and territorial, preferring cover in deep forest, but also ranging in open areas. The cat hunts by stalk-and-ambush and may take a variety of mid- and large-sized prey, particularly ungulates. Males are much larger than females and have larger home ranges.
An endangered species, the majority of the world's tigers probably now live in captivity (VS 2006). A century ago, it was estimated that there were over 100,000 tigers in the world; now numbers are down to below 2,500 mature breeding individuals. Of the nine recognized subspecies of tigers at the beginning of the twentieth century, only six remain.
- 1 Physical characteristics
- 2 Biology and ecology
- 3 Extinction risk
- 4 Subspecies
- 5 Evolution
- 6 Tigers in literature, culture, and medicine
- 7 Gallery
- 8 Notes
- 9 References
- 10 Credits
There are various measures utilized for protecting tigers and the environment in general. Key instruments include instituting laws and regulations, environmental education, and providing economic incentives for individuals, communities, and nations to care for their environment. For a comprehensive approach, a fourth fundamental pillar for guiding human behavior involves the human spiritual and religious dimension and the fundamental role that religious institutions potentially can play in environmental preservation. This approach is exemplified by the 2006 call of the Dali Lama against the using, selling, or buying of wild animals. Subsequently, Tibetans destroyed many of their tiger skins that were used as ornamental garments, despite the high value of some of these skins.
Tigers are the heaviest species of cat found in the wild. The liger is actually the largest cat in the world, but it is not a species or subspecies, rather a non-breeding hybrid, being a cross between a male Panthera leo (lion), and a female Panthera tigris (tiger); it is denoted scientifically as Panthera tigris × Panthera leo (Milne 1927). The larger tigers are comparable in size to the biggest fossil felids.
The tiger subspecies differ strongly in size. Large male Siberian tigers (Panthera tigris altaica) can reach a total length of 3.5 meters (m) and a weight of 300 kilograms (kg). Apart of those exceptionally large individuals, male Siberian tigers usually have a head and body length of 190-220 centimeters (cm) and an average weight of 250 kg. (The tail of a tiger is 60-110 cm long.) The heaviest Indian Tiger (P. t. tigris) that is confirmed through reliable sources weighed 258 kg (570 pounds). Reports of tigers weighing far more than 300 kg are mentioned in literature, but none of these cases is confirmed (Mazak 1983). Females are smaller, those of the Siberian or Indian subspecies weigh only between 100 and 167 kg. Isle tigers like the Sumatran subspecies (P. t. sumatrae) are much smaller than mainland tigers and weigh usually only 100-140 kg in males and 75-110 kg in females. The extinct Bali tiger (P. t. balica) was even smaller with a weight of 90-100 kg in males and 65-80 kg in females.
Tigers have rusty-reddish to yellow-rusty coats, a whitish medial and ventral area, and stripes that vary from brown or hay to pure black. The form and density of stripes differs between subspecies, but most tigers have in excess of 100 stripes. The pattern of stripes is unique to each animal, and thus could potentially be used to identify individuals, much in the same way as fingerprints are used to identify people. This is not, however, a preferred method of identification, due to the difficulty of recording the stripe pattern of a wild tiger. It seems likely that the function of stripes is camouflage, serving to hide these animals from their prey. The stripe pattern is found on a tiger's skin, and if shaved, its distinctive camouflage pattern would be preserved.
There is a well-known mutation that produces the white tiger, an animal that is rare in the wild, but widely bred in zoos due to its popularity. The white tiger is not a separate sub-species, but only a color variation. There are also unconfirmed reports of a "blue" or slate-colored tiger, and largely or totally black tigers, and these are assumed, if real, to be intermittent mutations rather than distinct species.
Like most cats, tigers are believed to have some degree of color vision (SWBG 2002). Similar to the lion, the tiger has the ability to roar.
Biology and ecology
Tigers are found in a variety of habitats, from tropical rainforests and boreal forests to dry savannas, as they are found in Ranthambore National Park. Compared to the lion, the tiger prefers more dense vegetation, for which its camouflage is ideally suited, and where a single predator is not at a disadvantage compared to a pride. Among the big cats, only the tiger and jaguar are strong swimmers; tigers are often found bathing in ponds, lakes, and rivers.
Adult tigers are territorial and fiercely defensive. The size of a tiger's home range mainly depends on prey abundance and, in case of male tigers, access to females. A tigress may have a territory of 20 km², while the territories of males are much larger, covering 60-100 km². Female territories may overlap those of other females, but males are usually intolerant of other males within their territory. Because of their aggressive nature, territorial disputes can be violent and may end in the death of one of the males, though such fatalities are rare. Most encounters between tigers end without physical incident.
To identify his territory, the male marks trees by spraying urine and anal gland secretions on trees as well as by marking trails with scat. Males show a behavior called flehmen, a grimacing face, when identifying a female's reproductive condition by sniffing their urine markings.
Tigers have been studied in the wild using a variety of techniques. The populations of tigers were estimated in the past using plaster casts of their pugmarks (footprints). In recent times, camera trapping has been used instead. Newer techniques based on DNA from their scat are also being evaluated. Radio collaring has been a popular approach to tracking them for study in the wild.
Reproduction and life cycle
A female is only receptive for a few days and mating occurs frequently during that time period. A pair will copulate often and noisily, like other cats. The gestation period is 103 days and 3–4 cubs of about 1 kg (2 lb) each are born. The females rear them alone. Wandering male tigers may kill cubs to make the female receptive.
At 8 weeks, the cubs are ready to follow their mother out of the den. The cubs become independent around 18 months of age, but it is not until they are around 2–2½ years old that they leave their mother. The cubs reach sexual maturity by 3–4 years of age. The female tigers generally own territory near their mother, while males tend to wander in search of territory, which they acquire by fighting and eliminating another male.
Over the course of her life, a female tiger will give birth to an approximately equal number of male and female cubs. Tigers breed well in captivity, and the captive population in the United States may rival the wild population of the world.
In the wild, tigers mostly feed on larger ungulates (hoofed mammals), but they also take smaller prey. Tigers have been known to kill crocodiles on occasion (Bangalinet 2007; Sunquist and Sunquist 1988), although predation is rare and the predators typically avoid one another. Siberian tigers and brown bears are a serious threat to each other and they tend to avoid one another; however, tigers can and do kill larger brown bears. Even female tigers, which are considerably smaller than male tigers, are capable of taking down and killing adult gaurs by themselves. Sambar deer, wild boar, and gaur are the tiger's favored prey in India.
Like many predators, tigers are opportunistic and have shown the capability to eat much smaller prey, such as as langurs, peacocks, and hares. They also may kill such formidable predators as sloth bear, canids, leopards, and pythons as prey. Old and injured tigers have been known to attack humans or domestic cattle and are then termed as man-eaters or cattle-lifters, which often leads to them being captured, shot, or poisoned. The Sundarbans mangrove swamps of Bengal, where some healthy tigers have been known to hunt humans, have had a higher incidence of man-eaters.
In all of their range, tigers are the top predators and do not compete with other carnivores other than the dhole or Indian wild dog, which makes up for its relative lack of strength by numbers. While swimming, crocodiles can be dangerous to a tiger (Bangalinet 2007). Adult elephants are too dangerous to tigers to serve as common prey, but conflicts between elephants and tigers do sometimes take place. Young elephant and rhino calves are occasionally taken when they are left unprotected by their herds. A case where a tiger killed an adult female Indian rhino has been observed (Haemig 2007)
However, a desperate tiger will attack anything it regards as potential food, including humans.
Tigers primarily sleep during the day and begin hunting at dusk (Banglanet 2007). Tigers hunt alone and prefer primarily medium to large sized herbivores. They ambush their prey as other cats do, overpowering their prey from any angle, using their body size and strength to knock prey off balance. Even with their great masses, tigers can reach speeds of about 60 km/h (37 mph). The tiger uses its muscled forelimbs to hold onto the prey, bringing it to the ground. Once the prey is prone, the tiger bites the back of the neck, often breaking the prey's spinal cord, piercing the windpipe, or severing the jugular vein or carotid artery. Tigers prefer to bite the throats of large prey. The tiger remains latched onto the neck until its prey dies.
In the wild, tigers can leap as high as 5 m (16 ft) and as far as 9-10 m (30-33 ft), making them one of the highest-jumping mammals (just slightly behind cougars in jumping ability).
They have been reported to carry domestic livestock weighing 50 kg (110 lb) while easily jumping over fences 2 m (6 ft 6 in) high. Their heavily muscled forelimbs are used to hold tightly onto the prey and to avoid being dislodged, especially by large prey such as gaurs. Gaurs and water buffalo weighing over a ton have been killed by tigers weighing about a sixth as much. A single blow from a tiger's paw can kill a full-grown dog or human, or can incapacitate a 150 kg (330 lb) Sambar deer.
Humans are the tiger's most significant predator, as tigers are often poached illegally for their fur. Such poaching, as well as destruction of habitat, has greatly reduced tiger populations in the wild. A century ago, it is estimated there were over 100,000 tigers in the world; now numbers are down to below 2,500 mature breeding individuals, with no subpopulation containing more than 250 mature breeding individuals. The threat of extinction is mitigated, however, by the presence of some 20,000 tigers currently in captivity.
Many Indian tigers' parts find their way to China through Tibet, where it is widely used for making traditional costumes. At the Kalachakra Tibetan Buddhist festival in south India in January 2006, one of the most important Tibetian Buddhist festivals, the Dalai Lama preached a ruling against using, selling, or buying wild animals, their products, or derivatives (Denyer 2006; Huggler 2006). Subsequently, when Tibetan pilgrims returned to Tibet afterward, there was much destruction by Tibetans of their wild animal skins, including tiger and leopard skins used as ornamental garments and valued at many thousands of dollars (Denyer 2006; Huggler 2006). It has yet to be seen whether this will result in a long-term slump in the demand for poached tiger and leopard skins.
Tiger bones and nearly all body parts are used in traditional Chinese medicine for a range of purported uses including pain killers and aphrodisiacs. The use of tiger parts in pharmaceutical drugs in China is already banned. China has even made some offenses in connection with Tiger poaching punishable by death.
There are nine recent subspecies of tiger, three of which are extinct and one of which is almost certain to become extinct in the near future. The historical range of tigers (severely diminished today) ran through Russia, Siberia, Iran, Afghanistan, India, China, and south-east Asia, including the Indonesian islands.
These are the surviving subspecies, in descending order of wild population:
- The Bengal tiger or the Royal Bengal tiger (Panthera tigris tigris) is found in parts of India, Bangladesh, Nepal, Bhutan, and Myanmar. It lives in varied habitats—grasslands, subtropical and tropical rainforests, scrub forests, wet and dry deciduous forests, and mangroves. Male Bengal tigers range anywhere from 180 to 258 kg and females range between 100-160 kg. Males in the wild usually weigh 205 to 227 kg (450-500 lb), while the average female will weigh about 130 kg (Sunquist and Sunquist 2002). However, the northern Indian and the Nepalese Bengal tigers are considerably bulkier than those found in the south of the Indian Subcontinent. The Indian government's estimated population figure for these tigers is between 3,100 and 4,500, some 3,000 of which are found in India alone. However, many Indian tiger conservationists doubt this number, seeing it as overly optimistic. The number of Bengal tigers in India may be fewer than 2,000 (IJ 2005), as most of the collected statistics are based on pugmark (footprint) identification, which often gives a biased result. Even though this is the most "common" tiger, these tigers are under severe pressure from both habitat destruction and poaching. In 1972, India launched a massive wildlife conservation project, known as Project Tiger, to protect the depleting numbers of tigers in India. The project helped increase the population of these tigers from 1,200 in the 1970s, to 3,000 in the 1990s, and is considered as one of the most successful wildlife conservation programs.
- The Indochinese tiger (Panthera tigris corbetti), also called Corbett's tiger, is found in Cambodia, China, Laos, Myanmar, Thailand, and Vietnam. Indochinese tigers are smaller and darker than Bengal tigers. Males weigh from 150-190 kg (330-420 lb) on average, while females are smaller at 110-140 kg (242-308 lb). Estimates of its population vary between 1,200 to 1,800, but it seems likely that the number is in the lower part of the range. The largest current population is in Malaysia, where illegal poaching is strictly controlled, but all existing populations are at extreme risk from habitat fragmentation and inbreeding. In Vietnam, almost three-quarters of the tigers killed provide stock for Chinese pharmacies. Also, the tigers are seen by poor natives as a resource through which they can ease poverty.
- The Malayan tiger (Panthera tigris jacksoni), exclusively found in the southern (Malaysian) part of the Malay Peninsula, was not considered a subspecies in its own right until 2004. The new classification came about after a study by Luo et al. from the Laboratory of Genomic Diversity Study, part of the National Cancer Institute of the United States. Recent counts showed there are 600-800 tigers in the wild, making it the third largest tiger population behind the Bengal tiger and the Indochinese tiger. The Malayan tiger is a national icon in Malaysia, appearing on its coat of arms and in logos of Malaysian institutions, such as Maybank.
- The Sumatran tiger (Panthera tigris sumatrae) is found only on the Indonesian island of Sumatra. The Sumatran tiger is the smallest of all living tiger subspecies. Adult males weigh between 100-130 kg (220-286 lb), females 70-90 kg (154-198 lb). Their small size is a useful adaptation to the thick, dense forests of the Sumatra island where they reside, as well as the smaller-sized prey. The wild population is estimated at between 400 and 500, seen chiefly in the island's national parks. Recent genetic testing has revealed the presence of unique genetic markers, which have led some to speculate that it has the potential to diverge into a separate species, if it is not made extinct (Cracraft et al. 1998). Habitat destruction is the main threat to the existing tiger population (logging continues even in the supposedly protected national parks), but 66 tigers were recorded as being shot and killed between 1998 and 2000, or nearly 20 percent of the total population.
- The Amur tiger (Panthera tigris altaica), also known as the Siberian, Manchurian, or North China tiger, is confined completely to the Amur region in far eastern Siberia, where it is now protected. It is considered the largest subspecies of tiger (although the limited populations of northern Indian and Nepalese Bengal tigers possibly are larger in comparison.) The largest Amur (Siberian) tiger on record weighed 306 kg (675 lb) (Mazak 1983). The average weight of a male Amur tiger is around 227 kg (500 lb) (Sunquist and Sunquist 2002). The Amur tiger is also noted for its thick coat, distinguished by a paler golden hue and a smaller number of stripes. The Amur tiger is the largest and heaviest of all living felines. A six-month old Amur tiger can be as big as a fully grown leopard. There is only one cat that grows to a larger size than the male Siberian Tiger: The Liger, a hybrid, whose parents are always a male lion and a female tiger. The last two censuses (1996 and 2005) found 450-500 Amur tigers within their single and more or less continuous range, making it one of the largest undivided tiger populations in the world.
- The South China tiger (Panthera tigris amoyensis), also known as the Amoy or Xiamen tiger, is the most critically endangered subspecies of tiger and it is largely expected that it will become extinct. It is one of the smaller tiger subspecies. The length of the South China tiger ranges from 2.2-2.6 m (87-104 in) for both males and females. Males weigh between 127 and 177 kg (280-390 lb) while females weigh between 100 and 118 kg (220-260 lb). It seems likely that the last known wild South China tiger was shot and killed in 1994, and no live tigers have been seen in their natural habitat for the last 20 years. In 1977, the Chinese government passed a law banning the killing of wild tigers, but this appears to have been too late to save the subspecies. There are currently 59 known captive South China tigers, all within China, but these are known to be descended from only six animals. Thus, the genetic diversity required to maintain the subspecies may no longer exist, making extinction a possibility. Currently, there are breeding efforts to reintroduce these tigers to the wild by 2008.
Extinct tiger subspecies
- The Balinese tiger (Panthera tigris balica) has always been limited to the island of Bali. These tigers were hunted to extinction—the last Balinese tiger is thought to have been killed at Sumbar Kima, West Bali, on September 27, 1937; this was an adult female. No Balinese tiger was ever held in captivity. The tiger still plays an important role in Balinese Hindu religion.
- The Javan tiger (Panthera tigris sondaica) was limited to the Indonesian island of Java. It now seems likely that this subspecies was made extinct in the 1980s, as a result of hunting and habitat destruction, but the extinction of this subspecies was extremely probable from the 1950s onwards (when it is thought that fewer than 25 tigers remained in the wild). The last specimen was sighted in 1979.
- The Caspian tiger or Persian Tiger (Panthera tigris virgata) appears to have become extinct in the late 1960s, with the last reliable sighting in 1968, though it is thought that such a tiger was last killed in the south-eastern-most part of Turkey in 1970. Historically it ranged through Afghanistan, Iran, Iraq, Pakistan, the former Soviet Union, and Turkey. The Caspian tiger was a large subspecies and reached nearly the dimensions of the Bengal Tiger. The heaviest confirmed weight of a male was 240 kg. The ground color was comparable to that of the Indian subspecies, but differed especially in the tight, narrow striping pattern. The stripes were rather dark gray or brown than black. Especially during the winter the fur was relatively long. The Caspian tiger was one of two subspecies of tiger (along with the Bengal) that was used by the Romans to battle gladiators and other animals, including the Barbary Lion.
The tiger is uncommon in the fossil record. The oldest remains of a tiger-like cat, called Panthera palaeosinensis, have been found in China and Java. This species occurred about 2 million years ago at the beginning of the Pleistocene and was smaller than a tiger. Early true tiger fossils stem from Java and are between 1.6 and 1.8 million years old. Distinct fossils from the early and middle Pleistocene were discovered in deposits from China, Sumatra, and Java. For example, a specimen classified as the subspecies Trinil tiger (Panthera tigris trinilensis) lived about 1.2 million years ago and was found at the locality of Trinil, Java, Indonesia (the site of the finding of the fossil of the famous Java man) (Van den Hoek Ostende 2006).
In India and northern Asia, the tiger appears for the first time in the late Pleistocene. Fossil tigers were also found in eastern Beringia and Sachalin island. Tiger fossils of the late Pleistocene have also turned up in Japan. These fossils indicate that the Japanese tiger was not bigger than the island subspecies of tigers of recent ages. This may be due to the phenomenon in which body size is related to environmental space (sometimes known as island dwarfism), or in the case of a large predator like a tiger, availability of prey.
Tigers in literature, culture, and medicine
The tiger has long been a subject of imaginative literature. Both Rudyard Kipling in The Jungle Book and William Blake in Songs of Experience depict the tiger as a menacing and fearful animal. In The Jungle Book, the tiger, Shere Khan, is the wicked mortal enemy of the protagonist, Mowgli. However, other depictions are more benign: Tigger, the tiger from A. A. Milne's Winnie the Pooh stories, is cuddly and likable. The famous comic strip Calvin and Hobbes features Calvin and his stuffed tiger, Hobbes. A tiger also is featured on the cover of the popular cereal Frosted Flakes, bearing the name "Tony the Tiger." The tiger is also popular for sports teams nicknames and mascots.
The tiger is one of the 12 Chinese zodiac animals. In various Chinese arts and martial arts, the tiger is depicted as an equal rival towards the Chinese dragon. In Imperial China, a tiger 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 tiger is regarded as the king of the jungle in most parts of Asia, because its forehead has a marking which resembles the Chinese character 王, which means "king." Consequently, many cartoon depictions of tigers in China are drawn with 王 on their forehead.
In a poll organized by Animal Planet in 2004, more than 50,000 viewers from 73 countries voted to decide their favorite animal (Manchester 2004). The tiger received 10,904 votes, winning the title of the World's Favorite Animal, beating man's best friend, dog, by 17 votes. Third most popular was the dolphin, followed by the horse and the lion.
Many nations have the tiger listed as their national animal, including Bangladesh (Royal Bengal tiger), China (along with Dragon and Panda), India (Royal Bengal tiger), Malaysia, Nepal (Royal bengal tiger), North Korea (Siberian tiger), and South Korea (Siberian tiger).
Traditional Asian medicine
Tiger parts are used in traditional Chinese medicines. Many people in China believe that tiger parts have medicinal properties. There is no scientific corroboration to these beliefs, which include:
- The tail of the tiger is sometimes ground and mixed with soap to create an ointment for use in treating skin cancer.
- The bones found in the tip of the tiger's tail are said to ward off evil spirits.
- Crushed tiger bones added to wine serves as a Taiwanese general tonic.
- The feet of a tiger, when dipped in palm oil and hung in front of a door, is said to diminish the likelihood of evil spirits from entering.
- Tiger's skin is said to cure a fever caused by ghosts. In order to use it effectively, the user must sit on the tiger's skin, but beware; if too much time is spent on the tiger's skin, legend says the user will become a tiger.
- Adding honey to the gallstones and applying the combination to the hands and feet is said to effectively treat abscesses.
- Burnt tiger hair can allegedly drive away centipedes.
- Mixing the brain of a tiger with oil and rubbing the mixture on your body is an alleged cure for both laziness and acne.
- Rolling the eyeballs into pills is an alleged remedy for convulsions.
- If whiskers are kept as a charm, legend says one will be protected against bullets and have increased courage.
- One will allegedly possess courage and shall be protected from sudden fright if wearing a tiger's claw as a piece of jewelery or carry one in your pocket.
- Strength, cunning, and courage can allegedly be obtained by consuming a tiger's heart.
- Floating ribs of a tiger are considered a good luck talisman.
- The tiger's penis is said to be an aphrodisiac.
- Small bones in a tiger's feet tied to a child's wrists are said to be a cure for convulsions.
The American Zoo and Aquarium Association estimates that up to 12,000 tigers are being kept as private pets in the U.S., which is significantly more than the world's entire wild population (Lloyd and Mitchinson 2006). Part of the reason for the enormous privately held tiger population in the United States relates to legislation. Only nineteen states have banned private ownership of tigers, fifteen require only a license, and sixteen states have no regulations at all (Lloyd and Mitchinson 2006).
The success of breeding programs at American zoos and circuses led to an overabundance of cubs in the 1980s and 90s, which drove down prices for the animals. The Society for the Prevention of Cruelty to Animals (SPCA) estimates there are now 500 lions, tigers, and other big cats in private ownership just in the Houston area (Lloyd and Mitchinson 2006).
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