In the same region, precisely eastern Sumatra and Borneo, lives a larger relative, the orang-utan ("man of the woods"), or "mias," as it is known to the Dyaks. Like the gibbons it feeds on leaves, buds and soft fruits, especially the big, pulpy durian; and also like them is shy and mild in disposition.

This Malayan ape is smaller and weaker than its African cousins, males standing not more than four feet six inches, and weighing 160 pounds, while the females are smaller. The body is bulky, the belly protuberant, and the legs very short, while the arms are so long that the fingers hang down to the ankle. The coat is a variable dark brick red and long, forming a beard in old males. The head is short and high, with the bony crest of the skull and the ridge over the eyes less prominent than in the gorilla; while the nose is insignificant, and the jaws are large and protrusive, with a long smooth upper lip. The eyes have a pleading expression, the ears are small and closely appressed, and many of the older males have the cheeks greatly and distinctively broadened by flat callosities. Lastly, although its brain is most like that of man, the orang-utan is inferior, in general, to both the gorilla and the chimpanzee.