Siamang

Siamang
Conservation status
	Template:StatusNearConcern
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Primates
Family:	Hylobatidae
Genus:	Symphalangus; Gloger, 1841
Species:	S. syndactylus
Binomial name
	Symphalangus syndactylus; (Raffles, 1821)

The Siamang (Symphalangus syndactylus) is an arboreal, black furred gibbon native to the forests of Malaysia and Sumatra. The largest of the lesser apes, the siamang can be twice the size of other gibbons, reaching 1 m in height, and weighing up to 23 kg. The Siamang is the only species in the genus Symphalangus.

The Siamang is distinctive for two reasons. The first is the fact that two fingers on each hand are fused together (hence the name "syndactylus"). The second is the large "gular sac", which is a throat pouch that can be inflated to the size of its head, allowing siamangs to make loud resonating calls or songs.

There are two subspecies of Siamangs: the Sumatran Siamang (S. s. syndactylus) and the Malaysian Siamang (S. s. continentis, in peninsular Malaysia). The Siamang is the only species of gibbons which occurs sympatrically with other gibbons (Agile Gibbons and Lar Gibbons) throughout its entire range.

Siamangs can live up to 20 years in captivity.