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Miami MetroZoo (June 1, 2008) Siamang (Symphalangus syndactylus) The Siamang is the largest of the lesser apes. Siamangs and gibbons are the only anthropoid apes that habitually walk erect like humans. In their treetop habitat, they will walk along a vine as if on a tightrope with their hands held high for balance. The Siamang is distinctive for two reasons. The first is that two fingers on each hand are fused together (hence the name "syndactylus"). The second is the large "gular sac" (found in the male of the species), which is a throat pouch that can be inflated to the size of its head, allowing the Siamang to make loud resonating calls or songs. They are an endangered species. Earplugs required. Loud? Yeah, just a bit!

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