Untitled Document Pongids Orangutans Orangutans are found in the Southeastern countries of Sumatra and Borneo. They live in tropical rain forests, and are found at all levels of the forest on small branches. Rarely do they come down to the forest floor. Older individuals, however, may be forced to live most of their life on the ground due to their loss of strength and weight gain. They are predominantly frugivores, but have also been observed eating leaves, bark and bird eggs.
Orangutans are cautious climbers, and are mainly arboreal.
In the trees they move by grasping slender branches and climbing. They are usually cautious in grabbing branches with two or three arms or legs. On the ground they walk quadrupedally, using the lateral side of the palms. Orangutans are extremely flexible in the hip, knee, and shoulder joint. Their forearms are much longer than their hindlegs.