Rosamond Gifford Zoo

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Siamang Ape

Symphalangus syndactylus

The siamang ape is a species of lesser ape that lives in trees of rainforests. They are known for their extremely loud and boisterous vocalizations, often performed by a male and female pair as a duet.

Range & Habitat

Mountains of the Malay Peninsula and Sumatra (Indonesia), in rainforests and monsoon forests.

Conservation Status: Endangered

Endangered due to hunting, the illegal pet trade and habitat loss.


In the Wild: Fruit, leaves, flowers, insects, bird eggs and small vertebrates.

At the Zoo: Fruit, vegetables, greens, monkey biscuits and canned primate diet.

Life Span

In the Wild: 25-30 years; In Human Care: 30-40 years.

Fun Facts about the Siamang Ape

  • A siamang’s armspan can be as wide at 5 feet. This helps them to swing with ease from tree branch to tree branch.
  •  Siamang apes use hand over hand swinging (brachiation) as their chief mode of locomotion through the trees. They walk upright on the ground or on branches that are too large for them to grasp.
  •  Siamang apes communicate vocally using their distinctive throat sacs that can inflate to the size of a grapefruit. Their calls can be heard up to 1.2 miles away.
  •  Siamangs mate for life, forming strong bonds that will last until one partner passes away; only then will the remaining partner seek out another companion.


Siamang. (2019, October 02). Retrieved May 26, 2020, from

Siamang. (2020). Retrieved May 26, 2020, from

Siamang. (2020). Retrieved May 26, 2020, from

Updated June 13, 2023
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