The orangutans are a species of great apes. Known for their intelligence, they live in trees and they're the largest living arboreal animal. They've longer arms than other great apes, and their hair's typically reddish-brown, instead of the brown or black hair typical of other great apes; a new black-haired subspecies was recently discovered on Borneo by primatologist Birute Galdikas. Native to Indonesia and Malaysia, they're currently found only in rainforests on the islands of Borneo and Suma… (More on Orangutan)