The Northern White-cheeked Gibbon (Nomascus leucogenys) is a species of gibbon native to Vietnam, Laos, and the Yunnan province of China.1 It is closely related to the Southern White-cheeked Gibbon (Nomascus siki), with which it was previously considered conspecific.1 The females of the two species are virtually indistinguishable in appearance.3 References
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