Found only on the island of Borneo, Asia's largest island, Bornean orangutans have broader faces and shorter beards than their arboreal Sumatran cousins.

There are three subspecies of Borean orangutans: Northwest, Northeast, and Central. The largest is the Central subspecies, of which there are an estimated 35,000. The most threatened is the Northeast subspecies: due to its habitat being decimated by logging and hunting, there are only about 1,500 extant Northeast Borean apes.

Scientists predict that the Bornean orangutan population will fall another 22% by 2025, bringing the total number down to 47,000.