Siamang (Symphalangus syndactylus); this individual is in a zoo.
Image: Diego Delso, CC BY-SA 3.0, via Wikimedia Commons.
At a glance
- IUCN category
- EN · Endangered
- Animal group
- Mammals
- Population trend
- Decreasing
- FaunaHub record reviewed
- Checked against IUCN
- Matches source — IUCN's 2020 global assessment of Symphalangus syndactylus says EndangeredChecked 2026-10-09 against IUCN's Red List export published 2026-07-28 · assessment
Conservation overview
The siamang is the largest of the gibbons, a black, tree-swinging ape with a throat sac that amplifies its booming calls. It is assessed as Endangered.
Pairs sing loud duets that carry far through the forest.
Range & habitat
Rainforests of Sumatra and the Malay Peninsula.
Major threats
Threats below are drawn from the authoritative sources listed on this page. For the current, complete assessment, see the IUCN Red List.
- Deforestation
- Capture for the pet trade
- Habitat fragmentation
Why it matters
As an agile fruit-eater that swings through the canopy and disperses seeds, the siamang is a flagship for Southeast Asia's threatened rainforests.
Gallery
Siamang (Symphalangus syndactylus); a zoo individual.
Image: Diego Delso, CC BY-SA 3.0, via Wikimedia Commons.
Sources
Sources for Siamang
- IUCN Red List — look up Siamang (authoritative status)
- Animal Diversity Web