The northern white-cheeked gibbon is a Critically Endangered species of gibbon native to South East Asia. It is closely related to the southern white-cheeked gibbon, with which it was previously considered conspecific. The females of the two species are virtually indistinguishable in appearance.

Scientific name: Nomascus leucogenys

Conservation status: Critically Endangered (Population decreasing)

Mass: 9.6 lbs (Female)

Length: 18 in. (Female)

Lifespan: 25 to 28 years

Infraorder: Simiiformes

Kingdom: Animalia