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Siamang Gibbon

Siamang Gibbon

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Scientific Name:

Hylobates syndactylus


Peninsular Malaysia, Sumatra, Thailand.


Fruits, leaves and buds from trees, flowers, insects and birds eggs.


Habitat: Tropical rainforest.


Dimensions: 75-90cm

Weight: males 12.7kg max, females 11.5kg max

Gestation: 189-239 days, 1-2 young

Lifespan: 25-30

Social structure: Families with 2-6 members. Monogamous and highly territorial. Couple mark their territory vocally by singing a duet.

Estimated population in the wild: ~22,390

IUCN Status: Endangered

Threats: Habitat loss and fragmentation of their habitat due to logging, road development, conversion to agriculture, and Illegal pet trade.

Did you know that:

  1. Unlike other apes, they usually walk on two legs when on the ground.
  2. Their extra-long arms help them swing from branch to branch, leaping distances up to 9m.
  3. They are monogamous and pairs usually stay together for life.
  4. Siamangs are syndactylous, having their 2nd and 3rd toes fused by a thin webbing of skin.
  5. When fully inflated, the throat sac is comparable in size to the animal's head.

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