Physical characteristics Edit
Its coat is a yellow to light orange, and the stripes range from dark brown to black; the belly is white, and the tail is white with black rings. A mutation of the Bengal subspecies, the white tiger, has dark brown or reddish brown stripes on a white background, and some are entirely white. Black tigers have tawny, yellow or white stripes on a black background color. The skin of a black tiger, recovered from smugglers, measured 259 cm (102 in) and was displayed at the National Museum of Natural History, in New Delhi. The existence of black tigers without stripes has been reported but not substantiated.
The total body length, including the tail, of males is 270 to 310 cm (110 to 120 in), while females are 240 to 265 cm (94 to 104 in). The tail measures 85 to 110 cm (33 to 43 in), and the height at the shoulder is 90 to 110 cm (35 to 43 in). The average weight of males is 221.2 kg (488 lb), while that of females is 139.7 kg (308 lb).Male Bengal tigers from the northern Indian subcontinent are as large as Siberian tigers with a greatest length of skulls of 332 to 376 mm (13.1 to 14.8 in). In northern India and Nepal, males have an average weight of 235 kg (520 lb), and females 140 kg (310 lb). Recent studies of body weights of the different tiger subspecies have shown that Bengal tigers are on average larger than Siberian tigers.
The Bengal tiger's roar can be heard for up to 3 km (1.9 mi) away.
Tiger Records EditA heavy male Bengal tiger weighing 258.6 kg (570 lb) was shot in Northern India in 1938. In 1980 and 1984, scientists captured and tagged two male tigers (M105 and M026) in Nepal that weighed more than 270 kg (600 lb). The largest known Bengal tiger was a male with a head and body length of 221 cm (87 in) measured between pegs, 150 cm (59 in) of chest girth, a shoulder height of 109 cm (43 in) and a tail of just 81 cm (32 in), perhaps bitten off by a rival male. This specimen could not be weighed, but it was calculated to weigh no less than 272 kg (600 lb). Finally, according to the Guinness Book of Records, the heaviest tiger known was a huge male hunted in 1967, that measured 322 cm (127 in) in total length between pegs (338 cm (133 in) over curves), and weighed 388.7 kg (857 lb). This specimen was hunted in northern India by David Hasinger and is on exhibition in the Mammals Hall of the Smithsonian Institution.
In the beginning of the 20th century, there were reports of big males measuring about 12 ft (3.7 m) in total length; however, there was not scientific corroboration in the field, and it is probable that this measurement was taken over the curves of the body.
Genetic Ancestry Edit
Bengal tigers are defined by three distinct mitochondrial nucleotide sites and 12 unique microsatellite alleles. The pattern of genetic variation in the Bengal tiger corresponds to the premise that these tigers arrived in India approximately 12,000 years ago. This recent history of tigers in the Indian subcontinent is consistent with the lack of tiger fossils from India prior to the late Pleistocene and the absence of tigers from Sri Lanka, which was separated from the subcontinent by rising sea levels in the early Holocene. However, a recent study of two independent fossil finds from Sri Lanka, one dated to approximately 16,500 years ago, tentatively classifies them as being a tiger.
Behaviour And Ecology EditTigers do not live in prides as lions do. They do not live as family units because the male plays no part in raising his offspring. Tigers mark their territory by spraying urine on a branch or leaves or bark of a tree, which leaves a particular scent behind. Tigers also spray urine to attract the opposite sex. When an outside individual comes into contact with the scent, it learns that the territory is occupied by another tiger. Hence, every tiger lives independently in its own territory.
Male Bengal tigers fiercely defend their territory from other tigers, often engaging in serious fighting. Female tigers are less territorial: occasionally a female will share her territory with other females. If a male happens to enter a female's territory, he will probably mate with her, if she is not already pregnant or has a litter. If she is pregnant or has a litter, he has no choice but to find himself a new territory and another potential mate. Similarly, females entering a male's territory are known to mate with him. Both males and females become independent of their mother around 18 months old, whereupon the cubs have to establish their own territories and fend for themselves. A male's territory is larger than a female's territory.
Reproduction And Lifecycle EditMales reach maturity at 4–5 years of age, and females at 3–4 years. Mating can occur at any time, but is most prevalent between November and April. A tigress comes into heat at intervals of about 3–9 weeks, and is receptive for 3–6 days. After a gestation period of 104–106 days, 1–4 cubs are born in a shelter situated in tall grass, thick bush or in caves. Newborn cubs weigh 780–1600 g (2 lb) and they have a thick wooly fur that is shed after 3.5–5 months. Their eyes and ears are closed. Their milk teeth start to erupt at about 2–3 weeks after birth, and are slowly replaced by permanent dentition from 8.5–9.5 weeks of age onwards. They suckle for 3–6 months, and begin to eat small amounts of solid food at about 2 months of age. At this time, they follow their mother on her hunting expeditions and begin to take part in hunting at 5–6 months of age. At the age of 2–3 years, they slowly start to separate from the family group and become transient — looking out for an area, where they can establish their own territory. Young males move further away from their mother's territory than young females. Once the family group has split, the mother comes into heat again.
Hunting And Diet Edit
Tigers are obligate carnivores. They prefer hunting large ungulates such as chital, sambar, gaur, and to a lesser extent also barasingha, water buffalo, nilgai, serow and takin. Among the medium-sized prey species they frequently kill wild boar, and occasionally hog deer, muntjac and Gray langur. Small prey species such as porcupines, hares and peafowl form a very small part in their diet. Due to the encroachment of humans onto their habitat, they also prey on domestic livestock.
Bengal tigers have also been known to take other predators, such as leopards, wolves, jackals, foxes, crocodiles, Asiatic black bears, sloth bears, and dholes as prey, although these predators are not typically a part of the tiger's diet. Adult elephants and rhinoceroses are too large to be successfully tackled by tigers, but such extraordinarily rare events have been recorded. The Indian hunter and naturalist Jim Corbett described an incident in which two tigers fought and killed a large bull elephant. If injured, old or weak, or their normal prey is becoming scarce, they may even attack humans and become man-eaters.
In most cases, tigers approach their victim from the side or behind from as close a distance as possible and grasp the prey's throat to kill it. Then they drag the carcass into cover, occasionally over several hundred meters, to consume it. The nature of the tiger's hunting method and prey availability results in a "feast or famine" feeding style: they often consume 18–40 kilograms (40–88 lb) of meat at one time.
Population And Distribution EditIn 2010, the population of wild Bengal tigers in the Indian subcontinent is estimated to be fewer than 2,500. Of these, 1,165–1,657 are found in India, 200–419 in Bangladesh, mostly in the Sunderbans, 100–194 in Nepal and 67–81 in Bhutan. Over the past century tiger numbers have fallen dramatically, with a decreasing population trend. None of the Tiger Conservation Landscapes within the Bengal tiger range is large enough to support an effective population size of 250. Habitat losses and the extremely large-scale incidences of poaching are serious threats to the species' survival. The extent of area occupied by tigers is estimated at less than 1,184,911 square kilometres (457,497 sq mi), a 41% decline from the area estimated in the mid-1990s.
India EditThe Bengal tiger has been a national symbol of India since about the 25th century BCE when it was displayed on the Pashupati seal of the Indus Valley Civilisation. On the seal, the tiger, being the largest, represents the Yogi Shiva's people. The tiger was later the symbol of the Chola Empire from 300 CE to 1279 CE and is now designated as the official animal of India. The Project Tiger initiative launched in 1972 initially reversed the population decline, the decline has resumed in recent years; India's tiger population decreased from 3,642 in the 1990s to just over 1,400 from 2002 to 2008. Since then, the Indian government has undertaken several steps to reduce the destruction of the Bengal tiger's natural habitat in India.
In the past, Indian censuses of wild tigers relied on the individual identification of footprints known as pug marks — a method that has been criticized as inaccurate. Using modern camera trap counting methods, the landmark 2008 national tiger census report estimates only 1,411 adult tigers in India, plus uncensused tigers in the Sundarbans delta mangrove forests.
In May 2008, forest officials at the Ranthambore National Park in Rajasthan, India spotted 14 tiger cubs. In June 2008, a tiger from Ranthambore was relocated to the Sariska Tiger Reserve, where all tigers had fallen victim to poachers and human encroachments since 2005.
Rivaling the Chitwan-Parsa-Valmiki Tiger Conservation Unit in Nepal for the title of the world's best tiger habitat is the Western Ghats forest complex in western South India, an area of 14,400 square miles (37,000 km2) stretching across several protected areas. The challenge here, as throughout most of Asia, is that people literally live on top of the wildlife. The Save the Tiger Fund Council estimates that 7,500 landless people live illegally inside the boundaries of the 386-square-mile (1,000 km2) Nagarhole National Park in southwestern India. A voluntary if controversial resettlement is underway with the aid of the Karnataka Tiger Conservation Project led by K. Ullas Karanth of the Wildlife Conservation Society.
A 2007 report by UNESCO, "Case Studies on Climate Change and World Heritage" has stated that an anthropogenic 45-cm rise in sea level, likely by the end of the 21st century, according to the Intergovernmental Panel on Climate Change, combined with other forms of anthropogenic stress on the Sundarbans, could lead to the destruction of 75% of the Sundarbans mangroves.
The Forest Rights Act passed by the Indian government in 2006 grants some of India's most impoverished communities the right to own and live in the forests, which likely brings them into conflict with wildlife and under-resourced, under-trained, ill-equipped forest department staff. In the past, evidence showed that humans and tigers cannot co-exist.
In 2004, 200 tigers were estimated to live in Bangladesh, most of them in the Sundarbans, and a few in the eastern hilly part of the country.
The tiger population in the Terai of Nepal is split into three isolated and vulnerable subpopulations — inhabiting Chitwan National Park and the adjacent Parsa Wildlife Reserve, Bardia National Park and Sukla Phanta Wildlife Reserve. The number of adult tigers has reached 155 after a serious decline. A survey conducted from December 2009 to March 2010 indicates that 125 adult tigers live in Chitwan National Park and its border areas covering 1,261 km2 (487 sq mi).
Once a royal hunting reserve, Chitwan became a national park in 1973. New economic incentives give villagers a direct stake in this renowned tourist attraction, with more than a third of revenues from park entrance fees being returned to the 300,000 people living in 36 villages in the surrounding buffer zone. As a result, locals are now creating and managing tiger habitat and consider themselves guardians of their tigers.
In Bhutan, scientists have evidence of a richer tiger population than previously estimated. Camera traps snapped photos of a wild tiger high in the Himalayas, at the surprising elevation of 13,000 feet (4,000 m). This offers new possibilities for suitable tiger habitat.
The most significant immediate threat to the existence of wild tiger populations is the illegal trade in poached skins and body parts between India, Nepal and China. The governments of these countries have failed to implement adequate enforcement response, and wildlife crime remained a low priority in terms of political commitment and investment for years. There are well-organised gangs of professional poachers, who move from place to place and set up camp in vulnerable areas. Skins are rough-cured in the field and handed over to dealers, who send them for further treatment to Indian tanning centres. Buyers choose the skins from dealers or tanneries and smuggle them through a complex interlinking network to markets outside India, mainly in China.
The illicit demand for bones and body parts from wild tigers for use in Traditional Chinese medicine is another reason for the unrelenting poaching pressure on tigers on the Indian subcontinent. For at least a thousand years, tiger bones have been an ingredient in traditional medicines that are prescribed as a muscle strengthener and treatment for rheumatism and body pain.
Other factors contributing to their loss are urbanization and revenge killing. Farmers blame tigers for killing cattle and shoot them. Their skins and body parts may however become a part of the illegal trade.The Wildlife Protection Society of India (WPSI) works with law enforcement agencies in India to apprehend tiger poachers and wildlife traders throughout India. WPSI investigates and verifies any seizure of tiger parts and unnatural tiger deaths that are brought to their notice. Between 1994 and 2009, WPSI has documented 893 cases of tigers killed in India, which is just a fraction of the actual poaching and trade in tiger parts during those years. In 2007, police in Allahabad raided a meeting of suspected poachers, traders and couriers. One of the arrested persons was the biggest buyer of tiger parts in India who used to sell them off to the Chinese traditional medicinal market, using women from a nomadic tribe as couriers.
Conservation efforts Edit
An area of special interest lies in the Terai Arc Landscape in the Himalayan foothills in northern India and southern Nepal, where 11 protected areas comprising dry forest foothills and tall-grass savannas harbor tigers in a 49,000 square kilometres (19,000 sq mi) landscape. The goals are to manage tigers as a single metapopulation, the dispersal of which between core refuges can help maintain genetic, demographic, and ecological integrity, and to ensure that species and habitat conservation becomes mainstreamed into the rural development agenda. Nepal has developed a community-based tourism model, with a strong emphasis on sharing benefits with locals and on the regeneration of degraded forests. The approach has been successful in reducing poaching, restoring habitats, and creating a local constituency for conservation.
In India EditThe Indian Wildlife Protection Act of 1972 enables government agencies to take strict measures so as to ensure the conservation of the Bengal tigers. The Wildlife Institute of India estimates showed that tiger numbers had fallen in Madhya Pradesh by 61%, Maharashtra by 57%, and Rajasthan by 40%. The government's first tiger census, conducted under the Project Tiger initiative begun in 1973, counted 1,827 tigers in the country that year. Using that methodology, the government observed a steady population increase, reaching 3,700 tigers in 2002. However, the use of more reliable and independent censusing technology (including camera traps) for the 2007–2008 all-India census has shown that the numbers were in fact less than half than originally claimed by the Forest Department. Tiger scientists in India, such as Raghu Chundawat and Ullas Karanth, have faced criticism from the forest department. Both these scientists have been for years calling for use of technology in the conservation efforts. Chundawat, in the past, had been involved with radio telemetry (collaring the tigers). While studying tigers in Panna tiger reserve, he repeatedly warned the FD authorities about the problem of tiger poaching in the reserve; they remained in denial, producing bogus numbers of tigers in their reports, and banned Chundawat from the reserve. Eventually, however, it was proven he was right, as in 2008. the authorities admitted that all tigers in Panna have been poached. Karanth has been instrumental in using camera traps, radiotelemetry and prey counts. During the 1990s and early 2000s he also noticed that tiger numbers were significantly lower than the official figures; his insistence on using modern science in tiger conservation and uncompromising efforts to save tigers and their habitat have earned him many enemies.
In Bangladesh Edit
The Sundarbans tiger project is a Bangladesh Forest Department initiative that started its field activities in February 2005. The idea for creating such a project was first developed during a field survey in 2001, conducted by Md. Osman Gani, Ishtiaq U. Ahmad, James L. D. Smith and K. Ullas Karanth. They realized that the Sundarbans mangrove forest at the mouth of the Ganges River contained probably one of the largest populations of wild tigers left in the world. As such, there was an urgent need to start measures that would ensure the protection of this precious area. The Save the Tiger Fund and the United States Fish and Wildlife Service generously donated funds to support the initial phase of research that aimed to collect data on tiger ecology using telemetry, and study the tiger’s environment by assessing its habitat and prey. But management of a wilderness area needs more than just information on the species to be protected. Personnel with skills and resources to implement conservation strategies, and the general support of the country are also required. So from the research base, the project is evolving rapidly to also encompass capacity building and conservation awareness activities. It has been able to do so through the forward thinking approach to management taken by the Forest Department, and the incredible support of the Bangladeshi people. The project is administered by the Forest Department. At the field level, there is a team of 8 persons, made up of Forest Department personnel and one wildlife consultant from the University of Minnesota who advises on research strategies and trains staff.
In Nepal Edit
The government aims at doubling the country's tiger population by 2022, and in May 2010, decided to establish Banke National Park with a protected area of 550 square kilometres (210 sq mi), which bears good potential for tiger habitat.
In Captivity Edit
Indian zoos have bred tigers since 1880, the first time being at the Alipore Zoo in Kolkata. The 1997 International Tiger Studbook lists the global captive population of Bengal tigers at 210 individuals that are all kept in Indian zoos, except for one female in North America. Completion of the Indian Bengal Tiger Studbook is a necessary prerequisite to establishing a captive management program for tigers in India.
Relationship With Humans Edit
Genetic Pollutions Edit
Tara, a hand-reared supposedly Bengal tigress acquired from Twycross Zoo in England in July 1976, was trained by Billy Arjan Singh and reintroduced to the wild in Dudhwa National Park, India, with the permission of India's then-Prime Minister Indira Gandhi, in an attempt to prove that zoo-bred, hand-reared tigers can be released in the wild with success. In the 1990s, some tigers from Dudhwa were observed which had the typical appearance of Siberian tigers: white complexion, pale fur, large head and wide stripes. With recent advances in science, it was subsequently found that Siberian tigers' genes have polluted the otherwise pure Bengal tiger gene pool of Dudhwa National Park. It was proved later that Twycross Zoo had been irresponsible and maintained no breeding records and had given India a hybrid Siberian-Bengal tigress instead. Dudhwa tigers constitute about 1% of India's total wild population, but the possibility exists of this genetic pollution spreading to other tiger groups; at its worst, this could jeopardize the Bengal tiger as a distinct subspecies.
Attack On Humans EditTigers are known to not like the presence of humans in their territory, since they like to be alone. Any human interference in tiger hunting or whilst nursing are met by the tiger unwelcomingly. There have been incidences where mother tigers have been separated from their cubs due to human interference. A well-known incident occurred in Bandhavgarh National Park, where a tigress known as Mohini was separated from her cubs while crossing the road, since some tourists blocked her road to the other side, resulting in losing her contact with her cubs, who had already crossed the road. Usually, tigers become man eaters when they grow old and have no strength to hunt.[original research?] At such times, if a human comes in contact with the tiger, he/she may be killed. But that is not the only reason why tigers become man eaters. If tigers do not have enough prey to feed upon, due to an imbalance in the food chain, they will often try to hunt humans. If a young tiger has injured teeth or paws, then it becomes difficult for him to tear apart his prey, which is also another reason for him to eat man.
Re - Wilding Project In South Africa Edit
In 2000, the Bengal tiger re-wilding project Tiger Canyons was started by John Varty, who together with the zoologist Dave Salmoni trains captive-bred tiger cubs how to stalk, hunt, associate hunting with food and regain their predatory instincts. It is claimed that once the tigers prove that they can sustain themselves in the wild, they would be released into the wilderness of South-Africa to fend for themselves; and that two tigers have already been re-wilded, and two more are undergoing re-wilding training.
Two of the tigers were bred in the USA and hand-raised at Bowmanville Zoo in Canada, while the other two were bred in South Africa. The four tigers involved in this project are not purebred Bengal tigers, should neither be used for breeding nor being released into the Karoo, which for them is unsuitable habitat. These tigers have been confirmed to be crossbred Siberian–Bengal tigers. Tigers that are not genetically pure are not allowed to be released into the wild and will not be able to participate in the tiger Species Survival Plan, which aims to breed genetically pure tiger specimens.
This project was featured by The Discovery Channel as a documentary Living With Tigers. Voted as one of the best Discovery Channel documentaries in 2003, the project has been proven to be a fraud in 2004. The tigers are unable to hunt, and the film crew chased the prey up against the fence and into the path of the tigers just for the sake of dramatic footage. Cory Meacham, a US-based environmental journalist, mentioned that "the film has about as much to do with tiger conservation as a Disney cartoon." In addition, the tigers have not been released, and indeed still reside in a small enclosure under constant watch and with frequent human contact. The Discovery documentary contains footage that its maker, John Varty, has admitted on affidavit to be false. Conservationists fear that the public will be misled in this cynical fashion.
Usage Within Sports Edit
- The logo of Bangladesh Cricket Board features a Royal Bengal Tiger.
- Cincinnati's National Football League team is named the Cincinnati Bengals.
- The Detroit's MLB team Detroit Tigers are nicknamed the Bengals.
- Dominican Republic's most successful baseball team Licey Tigers are nicknamed the Bengals.
- The team from Kolkata in the Indian Cricket League is called the Royal Bengal Tigers.
- Louisiana State University's Tigers are nicknamed the Bayou Bengals.