San Diego Zooのインスタグラム(sandiegozoo) - 10月7日 04時30分

You've heard of flipping the bird; how about flipping the lip?

When threatened, a gelada displays aggression through the "lip flip," an act of eversion in which they turn their upper lips inside out on their nostrils to reveal their gums and teeth. Despite a diet of mainly grass, they're equipped with large canines that are used as a sign of dominance.

📸: Agustin Valadez

#FangFriday #Gelada #OldWorldMonkey #SanDiegoZoo

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