Borneo orangutan Photo credit Milo Galaga
Orangutans live in Indonesia and Malaysia. Today, they can only be found on Borneo and the north of Sumatra. They do not live in large groups like gorillas and chimpanzees, but are solitary, with males living alone and females living with their offspring. Young stay with their mother until they reach puberty. Also unlike gorillas and chimpanzees, orangutans are mainly arboreal, spending most of their time in the trees. There are three species of orangutans: Sumatran orangutans (Pongo abelii), Tapanuli orangutans (Pongo tapanuliensis), and Bornean orangutans (Pongo pygmaeus).