The Sumatran tiger (Panthera tigris sumatrae) is a rare tiger subspecies that inhabits the Indonesian island of Sumatra. It was classified as critically endangered by IUCN in 2008 as the population was estimated at 441 to 679 individuals, with no subpopulation larger than 50 individuals and a declining trend.
Males have a prominent ruff, which is especially marked in the Sumatran tiger.
The Sumatran tiger is one of the smallest tiger subspecies. Males weigh 100 to 140 kg (220 to 310 lb) and measure 220 to 225 cm (87 to 89 in) in length between the pegs with a greatest length of skull of 295 to 335 mm (11.6 to 13.2 in). Females weigh 75 to 110 kg (170 to 240 lb) and measure 215 to 230 cm (85 to 91 in) in length between the pegs with a greatest length of skull of 263 to 294 mm (10.4 to 11.6 in).