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

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

Xu Jian / White cheeked gibbon feeding in tree {Hylobates concolor leucogenys} Yunnan China