Gibbons are apes in the family Hylobatidae. The family historically contained one genus, but now is split into four genera and 18 species. Gibbons occur in tropical and subtropical rainforests from eastern Bangladesh and northeast India to southern China and Indonesia (including the islands of Sumatra, Borneo, and Java ).
Also called the smaller apes or lesser apes, gibbons differ from great apes (chimpanzees, bonobos, gorillas, orangutans, and humans) in being smaller, exhibiting low sexual dimorphism, and not making nests. In certain anatomical details, they superficially more closely resemble monkeys than great apes do, but like all apes, gibbons are tailless. Unlike most of the great apes, gibbons frequently form long-term pair bonds. Their primary mode of locomotion, brachiation, involves swinging from branch to branch for distances up to 15 m (50 ft), at speeds as high as 55 km/h (34 mph). They can also make leaps up to 8 m (26 ft), and walk bipedally with their arms raised for balance. They are the fastest and most agile of all tree - dwelling, nonflying mammals.
Depending on species and sex, gibbons' fur coloration varies from dark to light brown shades, and any shade betweenblack and white, though a completely " white " gibbon is rare.
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