The orangutans are two species of great apes known for their intelligence and their long arms and reddish-brown hair. They are the most arboreal of the great apes, spending nearly all of their time in the trees. Every night they fashion nests to sleep in from branches and foliage. They are more solitary than the other apes, with males and females generally coming together only to mate. Mothers stay with their babies until the offspring reach an age of six or seven years. There is significant sexual dimorphism between females and males: females can grow to around 4'2" or 1.3 meters and weigh around 100 lbs, while fully mature males can reach 5'9" or 1.8 metres in height and weigh over 260 lbs. Fully mature males can be distinguished by their prominent cheek phalanges and longer hair. They are found only in rainforests on the islands of Borneo and Sumatra, though fossils have been found in Java, Vietnam and China.
Facts about Orangutan