Sweet gibbons climbing and playing

Any of the roughly 20 species of tiny apes known as gibbons are found in Southeast Asia's tropical forests. A human-like build and the absence of a tail distinguish gibbons from the other great apes (gorillas, orangutans, chimpanzees, and bonobos), but gibbons lack higher cognitive functions and self-awareness. They also have larger arms, thicker hair, and a neck pouch that amplifies sound, which set them apart from big apes. Gibbon vocals are strong, have a melodious tone, and travel far. The most recognizable vocalization is the "great call," which is typically a duet in which the female sings the lead note and the male joins in with a note that is less complex. Both sexes use this call to mark their territory.

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