Sumatran tiger (Panthera tigris sumatrae) is a subspecies of tiger found on the Indonesian island of Sumatra. Recent genetic testing has revealed the presence of unique genetic markers, which isolate Sumatran tigers from all mainland subspecies. Currently, there are only 400-500 Sumatran tigers left in the wild. The Sumatran Tiger is the smallest of all surviving tiger subspecies. Male Sumatran tigers average 204 cm (6 feet, 8 inches) in length from head to tail and weigh about 136 kg (300 lb). Females average 198 cm (6 feet, 6 inches) in length and weigh about 91 kg (200 lb). Its stripes are narrower than other subspecies of tigers' stripes, and it has a more bearded and maned appearance, especially the males. Its small size makes it easier to move through dense rain forests. It has webbing between its toes that, when spread, makes Sumatran tigers very fast swimmers. It has been known to drive hoofed prey into the water, especially if the prey animal is a slow swimmer.

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