Heather Angel / Northern white cheeked gibbon (Nomascus leucogenys) female standing in tree with baby aged two weeks. Parents captive bred and released. Wild Elephant Valley / Xishuangbanna, Yunnan Province, China, 2...

Rod Williams / Young male Northern White-cheeked Crested Gibbon (Nomascus leucogenys) Northern Vietnam. Critically Endangered, Captive

Rod Williams / Northern / Chinese white-cheeked gibbon (Nomascus leucogenys) female head portrait, Laos, Vietnam, critically endangered species. Captive.

Heather Angel / Chinese white cheeked gibbon (Nomascus leucogenys) female hanging from tree, carrying baby aged two weeks. Parents released into wild from captive breeding programme. Wild Elephant Valley / Xishuangba...

Heather Angel / Chinese white cheeked gibbon (Nomascus leucogenys) female hanging, carrying baby aged two weeks. Parents released into wild from captive breeding programme. Wild Elephant Valley / Xishuangbanna, Yunna...

Heather Angel / Chinese white cheeked gibbon (Nomascus leucogenys) female walking whilst carrying baby aged two weeks, holding on to vines for support. Parents released into wild from captive breeding programme. Wild...

Heather Angel / Northern white cheeked gibbon (Nomascus leucogenys) female hanging from tree with baby aged two weeks. Wild Elephant Valley / Xishuangbanna, Yunnan Province, China.

Rod Williams / Young female Northern White-cheeked Crested Gibbon (Nomascus leucogenys) Northern Vietnam. Critically Endangered. Captive

Rod Williams / Male Northern White-cheeked Crested Gibbon (Nomascus leucogenys) Part of female visible top right, Northern Vietnam. Critically Endangered. Captive

Rod Williams / White cheeked gibbon, male {Hylobates concolor leucogenys} endangered, captive, from Vietnam and Laos

Juergen & Christine Sohns / White-cheeked Gibbon (Nomascus leucogenys) female in tree, South Australia, Australia

Roland Seitre / Southern white-cheeked gibbon (Nomascus siki) on branch. Captive, occurs in Lao People's Democratic Republic and Vietnam. Endangered species.