Adults have a dark grey throat sac.
They range across Sumatra and the Malay Peninsula. Habitat Siamangs inhabit primary and secondary forest. The majority of their diet is made up of leaves, but they also feed on fruit, flowers and a small amount of animal prey. Social organisation and behaviour Siamangs live in family groups, with one reproducing male and female and their offspring. They are diurnal and arboreal, and the female leads the troop.