Monday, 11 April 2011

Tiger

The tiger is the largest cat species, reaching a total body length of up to 3.3 m (11 ft) and weighing up to 306 kg (670 lb). Its most recognizable feature is a pattern of dark vertical stripes on reddish-orange fur with a lighter underside. It has exceptionally stout teeth, and the canines are the longest among living felids with a crown height of as much as 74.5 mm (2.93 in) or even 90 mm (3.5 in).In zoos, tigers have lived for 20 to 26 years, which also seems to be their longevity in the wild.They are territorial and generallysolitary but social animals, often requiring large contiguous areas of habitat that support their prey requirements. This, coupled with the fact that they are indigenous to some of the more densely populated places on Earth, has caused significant conflicts with humans.
Tigers once ranged widely across Asia, from Turkey in the west to the eastern coast of Russia. Over the past 100 years, they have lost 93% of their historic range, and have been extirpated from southwest and central Asia, from the islands of Java and Bali, and from large areas of Southeast and Eastern Asia. Today, they range from the Siberian taiga to open grasslands and tropicalmangrove swamps. The remaining six tiger subspecies have been classified as endangered by IUCN. The global population in the wild is estimated to number between 3,062 and 3,948 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 includehabitat destruction, habitat fragmentation andpoaching. The extent of area occupied by tigers is estimated at less than 1,184,911 km2 (457,497 sq mi), a 41% decline from the area estimated in the mid-1990s.
Tigers are among the most recognisable and popular of the world's charismatic megafauna. They have featured prominently in ancient mythology and folklore, and continue to be depicted in modern films and literature. Tigers appear on many flags, coats of arms, and asmascots for sporting teams. It is the national animalof Bangladesh (specifically the Bengal Tiger), India,Vietnam, Malaysia (specifically the Malayan tiger) andSouth Korea.

                  

       

White tigers

Breeding of white tigers will often lead to inbreeding as the trait is recessive. Many initiatives have taken place in white and orange tiger mating in an attempt to remedy the issue, often mixing subspecies in the process. Such inbreeding has led to white tigers having a greater likelihood of being born with physical defects, such as cleft palates and scoliosis (curvature of the spine).Furthermore, white tigers are prone to having crossed eyes .Even apparently healthy white tigers generally do not live as long as their orange counterparts. Records of white tigers were first made in the early 19th century. They can only occur when both parents carry the rare allele found in white tigers. An estimated one in 10,000 natural tiger births are white tigers. The white tiger is not a separate sub-species, but only a colour variation; since the only white tigers to have been observed in the wild have been Bengal tigers (and all white tigers in captivity are at least part Bengal), the recessive gene that causes the white colouring is commonly thought to be carried only by Bengal tigers. They are not in any way more endangered than tigers are generally, this being a common misconception. Another misconception is white tigers are albinos, despite pigment being evident in the white tiger's stripes. They are distinct not only because of their white fur, but also their blue eyes.

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