The orangutan is the largest arboreal animal in the world. Females weigh between 65 to 110 pounds, and can grow to about 1.3 meters in height. Males weigh from 110 to 200 pounds, almost twice as much as females, and can grow to about 1.8 meters. This difference between males and females is called sexual dimorphism. Males also grow large cheek pads made out of fibrous tissue and a throat sac under the chin; these help the male produce a long call that can last up to two minutes and be heard up to 1 kilometer away. Both males and females have thick, long reddish-brown hair and grow a beard and mustache as they mature.
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