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The Sumatran tiger (''Panthera tigris sumatrae'') is a rare tiger subspecies that inhabits the Indonesian island of Sumatra. It has been listed as Critically Endangered on the IUCN Red List in 2008 as the population was estimated at 441 to 679 individuals, with no subpopulation larger than 50 individuals and a declining trend. The Sumatran tiger is the only surviving member of the Sunda Islands group of tigers that included the now extinct Bali tiger and Javan tiger. Sequences from complete mitochondrial genes of 34 tigers support the hypothesis that Sumatran tigers are diagnostically distinct from mainland populations. == Characteristics == Pocock first described the Sumatran tiger on the basis of several skull, pelage and striping features in which it is distinct from the Indian and Javan tigers. It is darker in fur colour and has thicker stripes than the Javan tiger.〔Pocock, R. I. (1929). "Tigers". ''Journal of the Bombay Natural History Society'' 33: 505–541.〕 Stripes tend to disintegrate into spots near their ends, and lines of small dark specks between regular stripes may be found on the back, flanks and hind legs. The frequency of stripes is higher than in other subspecies.〔Kitchener, A. (1999). (''Tiger distribution, phenotypic variation and conservation issues'' ). Pages 19–39 in: Seidensticker, J., Christie, S., Jackson, P. (eds.) ''Riding the Tiger. Tiger Conservation in human-dominated landscapes''. Cambridge University Press, Cambridge, ISBN 0-521-64057-1.〕 Males have a prominent ruff, which is especially marked in the Sumatran tiger.〔Nowell, K., Jackson, P. (1996). (Tiger ''Panthera tigris'' (Linnaeus 1758) ) in: ''Wild Cats: status survey and conservation action plan.'' IUCN/SSC Cat Specialist Group, Gland, Switzerland〕 The Sumatran tiger is one of the smallest tiger subspecies. Males weigh and measure in length between the pegs with a greatest length of skull of . Females weigh and measure in length between the pegs with a greatest length of skull of .〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「sumatran tiger」の詳細全文を読む スポンサード リンク
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