The Tapamuli Orangutan has recently been discovered. There are only thought to be 800 of these animals left and they are only found within the Batang Toru Forest of North Sumatra. It is thought that they have been a separate from the Borneon Orangutan for 674,000 years (despite living on Sumatra they appear to be more closely related to the Orangutans of Borneo than of Sumatra). As well as having such a tiny population they also live in an area of roughly 1000 square kilometres (386 square miles). This is the first great ape species to be discovered since 1929 when the Bonobo was discovered.
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