Strictly Vegetarian

A gum-baring yawn exposes the gelada monkey’s impressive canine teeth, which stand out against the reddish-pink color of their gums and the inside of their mouths. The yawn is often accompanied by a loud call, and researchers believe it functions as a long-distance display. Males used this yawn during periods of tension, such as the time right before feeding, suggesting it may serve to intimidate other geladas. In fact, these impressive canines are exclusively used for fighting or display, since these monkeys are strictly vegetarian.