The Gelada, a species of Old World monkey found only in the Ethiopian Highlands. They display threats by flipping their upper lips back to display their teeth and gums, and by pulling back their scalps to display the pale eyelids. Despite their fearsome a

The Gelada, a species of Old World monkey found only in the Ethiopian Highlands. They display threats by flipping their upper lips back to display their teeth and gums, and by pulling back their scalps to display the pale eyelids. Despite their fearsome a