The siamang (or Symphalangus syndactylus) is a species of gibbon living in the rainforests of the Malay Peninsula and Indonesian island of Sumatra. Their body is covered in all-black shaggy fur, which is thinner and grey on their faces. Siamangs have very long arms - their arm span approximately measuring twice their body length, short and sturdy legs and no tail. One of their most prominent features is the throat sac under their chin, which inflates during their distinctive vocalisations. Typically, siamangs are 75cm to 100cm tall and weigh between 10kg and 13kg. Like other lesser apes, this species exhibits little to no sexual dimorphism.
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Symphalangus syndactylus
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Animal Facts
Siamang monogamous pairs will often sing together for several minutes to mark and defend their territory and bond with each other.
The Siamang is the largest species of gibbon.
Siamangs play an important role in their native ecosystems, as frugivores they aid forest regeneration by spreading seeds via defecation.
Two toes on the siamang’s feet are connected by membrane, a feature unique to the siamang within the gibbon family.
Siamang families develop very close bonds; parents mate for life and the whole group travels together.
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