The former range of the Sumatran rhinoceros extended from the foothills of the Himalayas, east to Vietnam and China, south along the Malay peninsular and into the islands of Sumatra and Borneo (2). Two subspecies persist, the Eastern Sumatran rhinoceros (Dicerorhinus sumatrensis harrissoni
) historically found throughout Borneo may today number fewer than 50 individuals, all located within Sabah (6). The Western Sumatran rhinoceros (D. s. sumatrensis
) is found in fragments of Peninsular Malaysia and on the Island of Sumatra in Indonesia (6), numbers are critically low here too and the only viable population is located within the Gunung Leuser National Park in northern Sumatra (7).