#hylobates

White handed gibbons or lar gibbons (Hylobates lar) in Ouwehands Zoo, the Netherlands

Kloss's Gibbon Hylobates klossii

Also known as the Mentawai gibbon, the bilou or dwarf siamang. They exclusively live on the Mentawai Islands that lie to the west of Sumatra. Kloss's gibbon are unique gibbons because the two sexes do not vocalize songs in unison. Male Kloss's gibbon sing before the sun rises and female Kloss's gibbon vocalize songs once the sun has risen. Female Kloss's gibbon calls are unique and have slight variations in the different stages of the call. The calls emitted by the females could offer other members of the species information about their position in the canopy.

Eastern Gray Gibbon Hylobates funereus

Found in northeastern Borneo. As with the other two grey gibbons, this species is thought to be endangered due to heavy deforestation in Borneo, as well as increases in forest fires exacerbated by El Niño events.

Silvery Gibbon Hylobates moloch

A gibbon found only on the Indonesian island of Java, they eat fruits, leaves, and flowers. The silvery gibbon lives in pairs and stakes out territory that the pair strongly defends. Females sing to declare their territory several times a day, and if strangers are spotted, the male screams in an attempt to scare them away.

A white handed gibbon or lar gibbon (Hylobates lar) in Khao Yai National Park, Thailand