Once you know black, you don't go back? That's nonsense, as proven by the females of The Yellow-cheeked Gibbon (Nomascus gabriellae), also called the yellow-cheeked crested gibbon, the golden-cheeked crested gibbon or the buffed-cheeked gibbon. I show you a similar gibbon species, on a maxicard from PR China: The White-handed Gibbon (Hylobates lar)

"The Lar gibbon (Hylobates lar), also known as the white-handed gibbon, is a primate in the Hylobatidae or gibbon family. It is one of the better-known gibbons and is often seen in zoos."

http://en.wikipedia.org/wiki/File:Hylobates_lar_pair_of_white_and_black_01.jpg

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Now, back to the Yellow-cheeked Gibbon.

"The yellow-cheeked gibbon (Nomascus gabriellae), also called the yellow-cheeked crested gibbon, the golden-cheeked crested gibbon or the buffed-cheeked gibbon, is a species of gibbon native to Vietnam, Laos and Cambodia.^[1]

The yellow-cheeked gibbon is born blond and later turns black, and 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 and turn back to blond at sexual maturity and only have a black cap on the top of their heads."

http://en.wikipedia.org/wiki/Yellow-cheeked_gibbon

Blonde, black, blonde.

"Adult Pair of the Yellow-cheeked Crested Gibbon, also called Golden-cheeked Crested Gibbon or Buffed-cheeked gibbon in Edinburgh Zoo. Left the male, right the female. Source: Own work -> http://www.zoologie.de/grzimek/bild-gelbwangen-schopfgibbon-614.html"

http://en.wikipedia.org/wiki/File:Nomascus-gabriellae.jpg

http://en.wikipedia.org/wiki/Hylobatidae

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