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Black fur, unmistakable air sac on the neck which functionates to amplify its voice. Around 9 or 10 a.m., a pair of siamang gibbons do morning call to claim their territory. Although they are captive, they still show their natural behavior as they claim their cage as territory.
Tropical forest, arboreal apes. Distribution : Indonesia (Sumatera), Malaysia, and Thailand (IUCN)
Captive siamang gibbon at Schmutzer Primate Center, Ragunan, Jakarta, Indonesia. Endangered species according to IUCN red list.