Communication

staring: This display by the gelada baboon is used as a threat display

The eyes are fixed on the stimulus and the eyebrows are raised and the scalp is retracted

the facial skin is also stretched by moving the ears back

Under the eye lids the color is different which contrasts sharply with the surrounding facial color

 A starring Gelada baboon

staring with open mouth: This is the stare with  the mouth being open, but the teeth are covered

This is a threat expression and often occurs with head-bobbing like a rocker going wild

head-bobbing: This is used as a threat display by the gelada baboon and head bobs up and down

This often occurs with staring with open mouth as seen above

tension yawning: This is done by an adult male gelada baboons

This is when the mouth is opened fully to reveal the canines(sharp teeth)

Happens when a rival group or a predator is approaching the community

lipsmacking: This is when the lips are protruded, then smacked together repeatedly.

lip-flip: This is a variation on the fear grimace which is an expression of fear

the mouth is open, and the upper lip is flipped up, as a result, the pink gums are showing

 Gelada Baboons are lip flipping