The yellow-cheeked gibbon (Nomascus gabriellae) is born blond and later turns black. Males remain black and have the distinguishing golden cheeks. But the female is born blonde to blend into its mother's fur, turn black, then turns yellow again when they it matures keeping only a black cap on the top of its head. Also called the gold-cheeked, red-cheeked, yellow-cheeked, and buff-cheeked gibbon, it is endemic to Laos, southern Vietnam, and southeastern Cambodia. Tall evergreen and semi-evergreen forests are its preferred habitat, but is also found in mixed bamboo and woodland forests.
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