| Pongo pygmaeus The reddish-brown orangutan is found only in the completely isolated rain forests of Borneo and northern Sumatra. Swinging gracefully through the trees, these arboreal primates spend most of their time in lowland swamps, where they feed on fruits, leaves, flowers, stems, and insects. Although hunting and illegal trade were historically their primary threats, orangutans are now in danger of extinction because of the disappearance of their tropical rain forest habitat. |