The Orangutan:
Pongo pygmeaus, commonly known as the orangutan, is the largest living Asian primate. The orangutan inhabits Borneo and Sumatra, but once had a much larger geographical range. Female and young orangutans are primarily arboreal, but the males tend to travel on the ground quadrupedally with their hands in a fist compared to the knuckle walking of the gorilla and the chimp. The diet of the orangutan consists of fruit, leaves, shoots, bark, and insects. Socially, these primates are usually solitary unless a female has offspring and females and males alike maintain a territory. Like the gorilla, orangutans are very sexually dimorphic (males reaching 120 kg and females being half that size), but they are morphologically very different from the gorilla and chimp. The size of the canines is sexually dimorphic, the central incisors are large, and they have peg like laterals. They have a relatively high and rounded braincase, small browridges in contrast to gorillas, a robust mandible with a high ramus, a deep face, small orbits set close together, and a prognathic snout.