Southern Yellow-cheeked Crested Gibbon

The yellow-cheeked gibbon, also called the golden-cheeked gibbon, yellow-cheeked crested gibbon or red-cheeked gibbon, is a species of gibbon native to Vietnam, Laos and Cambodia. It was named after the British naturalist Gabrielle Maud Vassal. It is born blond and later turns black. Males keep this colouring and have the distinguishing golden cheeks, while females turn back to blond at sexual maturity, keeping only a black cap on the top of the head (Wikipedia, general species account).

This diurnal, arboreal gibbon lives in primary tropical forest, foraging for fruit and using brachiation to move through the trees. Little is known about the species in the wild.