Orangutans are arboreal apes which live in the rain forests of Sumatra and Borneo.
There are three species of orangutan and all three are classified as critically endangered by the IUCN. They are threatened by habitat loss due to palm-oil plantation, logging, mining, and the pet trade.
Orangutans spend their lives in the trees of the rain forest, they are the most arboreal of all the ape species.