The Javan rhino is a close relative of the greater one-horned rhino and bears the dubious distinction of being the world's most endangered large mammal species. The Javan rhino, or lesser one-horned rhino, favours dense lowland rainforests with plenty of mud wallows. It is a dusky gray colour, has a single horn and weighs between 2,000 and 3,000 pounds. It is mostly a browser but will graze on grass, leaves and fallen fruit. Javan rhinos are divided into two sub-species: one lives in Ujung Kulon, Indonesia and the other is found in Cat Tien National Park in Vietnam. Although both subspecies are called Javan or lesser one-horned rhino, the sub-species of Cat Tien National Park is called by some the Vietnamese rhinoceros. (Only the Vietnamese subspecies was thought to be extinct until it was rediscovered in the late 1980s.)