Of the great apes–a group that includes chimps, gorillas, and bonobos–the orangutan (found only in the tropical rain forests of Sumatra and Borneo islands) is the most endangered, currently. Recent wild fires, tribal conflicts and on-going deforestation has seriously dwindled their total habitat. Some primatologists believe that the orangutan is the closest primate relative to humans–more than even the chimpanzee.
