siamang

A large black gibbon (Hylobates syndactylus syn. Symphalangus syndactylus) of Sumatra and the Malay Peninsula, having an inflatable throat sac and a web of skin joining the second and third toes.

The gibbon Hylobates syndactylus or Siamanga syndactyla, the largest of the gibbons, with extremely long arms, and the second and third digits united to some extent. It is a very active arboreal ape, inhabiting Sumatra and the Malay peninsula. See gibbon.

A gibbon (Hylobates syndactylus), native of Sumatra. It has the second and third toes partially united by a web.

A large black gibbon, Symphalangus syndactylus, from Sumatra

large black gibbon of Sumatra having the 2nd and 3rd toes partially united by a web