The orang-utans are a species of great apes. Native to Indonesia and Malaysia, they are currently found only in rainforests on the islands of Borneo and Sumatra. The name orang-utan is derived from the Malay and Indonesian words orang meaning "person" and hutan meaning "forest", thus "person of the forest". The Sumatran Orang-utan (Pongo abelii) is the rarer of the two species of orang-utans. Living and endemic to Sumatra island of Indonesia, they are smaller than the Bornean Orang-utan. The Sumatran Orang-utan grows to about 1.4 metres tall and 90 kilograms in males. Females are smaller, averaging 90 centimetres and 45 kilograms.