Once widespread, the orangutan has been considered critically endangered since 2000, and is one of the world's most endangered primates. A century ago, more than 230,000 orangutans lived in our world, but their numbers have now dropped by around half.
Logging, forest fires, fragmentation, and especially the removal of tropical forests for palm oil, all critically threaten the orangutan's survival. Hunting and illegal pet trade have also dwindled numbers.
Over 104,000 Bornean orangutans still live in the wild, and can be found in both Malaysian and Indonesian Borneo. There are just 14,000 Sumatran orangutans left, naturally living on the Indonesian island of Sumatra.
The rarest of all is the newly-discovered Tapanuli species, with just 800 left in the wild. If you're lucky, you'll also be able to spot Tapanuli orangutans in the Batang Toru eco-system of Sumatra's north. As of late 2019, their habitat is under serious threat by the build of a controversial new hydropower plant, near the Batang Toru River.