Javan Gibbon

Javan GibbonOther Names: Silvery Gibbon
Scientific Name: Hylobates moloch
Conservation Status: Endangered
Body Length: 45–64 cm
Weight: 5–9 kg
Gestation: 210 days
Number of young: 1

Distribution: Java
Habitat: Rainforest

Description: Javan Gibbons have a fluffy appearance because of their very dense and long silvery-grey fur. They have very long forelimbs, long fingers and shorter thumbs which make them great brachiators (use their arms to swing between branches).

Diet: Javan Gibbons are omnivores and eat fruits, some leaves and sometimes nectar and grubs.

In the wild: They live in family groups made up of a male and female and up to three juvenile offspring. Like other gibbons the territory is maintained by patrols, physical conflict and loud calling.

Threats: An estimated 98% of the Javan Gibbons’ original habitat has been destroyed on the island of Java. They now live in 21 unconnected forest patches and the wild population is estimated to be less than 4,000 individuals. Active conservation management of the populations is essential for their long term survival.

At Perth Zoo: Perth Zoo is one of only six institutions in the world successfully breeding Javan Gibbons. The Javan Gibbons can be seen on one of the islands in the Main Lake.

Perth Zoo contributes to the conservation of wild Javan Gibbon populations through its fundraising program Wildlife Conservation Action. The Zoo also works closely with the Silvery Gibbon Project in its efforts to protect this species in the wild. To find out more about Silvery Gibbon Project, visit

Did you know? Unlike other gibbon species, the Javan Gibbon does not sing ‘duets’. The female is the dominant vocalist while the male sings only occasionally. You can hear a recording of a female gibbons’ call by downloading the call here.

Download the Javan Gibbon Fact Sheet (pdf).

Hear the Javan Gibbon’s song: 

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