Female adults at the Cincinnati Zoo
The yellow-cheeked gibbon (Nomascus gabriellae), also called the golden-cheeked gibbon, yellow-cheeked crested gibbon, the golden-cheeked crested gibbon, red-cheeked gibbon, or the buffed-cheeked gibbon, is a species of gibbon native to Vietnam, Laos, and Cambodia.
The yellow-cheeked gibbon is born blond and later turns black. Males carry this colouring through their lifespan and have the distinguishing golden cheeks. Females are born blonde to blend into their mother's fur but they later turn black. Females turn back to blond at sexual maturity, keeping only a black cap on the top of their heads.A male
The yellow-cheeked gibbon, like all gibbon species, has a unique song, which is usually initiated by the male. The female will then join in and sing with the male to reinforce their bond and announce to other gibbons that they are a pair in a specific territory. The male usually finishes the song after the female has stopped singing.
Little is known about this species in the wild, but it is thought that it has a life span of approximately 46 years.