he gibbon family, Hylobatidae, is composed of thirteen medium-sized species. Their major distinction is their long arms, which they use to brachiate through the trees. As an evolutionary adaptation to this arboreal lifestyle, their wrists are ball and socket joints. The largest of the gibbons, the Siamang, weighs up to 23 kg (50 lb). In comparison, the smallest great ape is the Common Chimpanzee at a modest 40 to 65 kg (88 to 143 lb). Gibbon apes have been known to brachiate at speeds up to 45mph. They are endangered please visit http://www.gibboncenter.org/contribute.htm
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SailorBarsoom 4 years ago