Description
English: A captive male Northern White-cheeked Gibbon (Nomascus leucogenys), recognisable due to the prominent white colouring, as is apparent on this specimen. This example is from the Adelaide Zoo in South Australia.
Date 5 October 2009
Source Own work
Author Bilby https://commons.wikimedia.org/wiki/User:Bilby
Source: https://commons.wikimedia.org/wiki/File:Male_White-Cheeked_Gibbon.jpg

The northern white-cheeked gibbon (Nomascus leucogenys) is a species of gibbon native to South East Asia. It is closely related to the southern white-cheeked gibbon (Nomascus siki), with which it was previously considered conspecific. The females of the two species are virtually indistinguishable in appearance. Northern white-cheeked gibbons reach sexual maturity at seven or eight years, and have lived for at least 28 years in the wild. Order: Primates, Superfamily: Hominoidea, Family: Hylobatidae, Synonyms: Hylobates leucogenys (Ogilby, 1840).