Females have cyclic pink perineal swelling. Young are born with eyes closed, but they open in about 2 hrs. Infants cling to mother's belly and nurse for 1 yr. Special Physical Adaptations Stands upright but walks on all four limbs. Powerful jaws with 32 teeth, arranged to give a nutcracker effect between back teeth.
Cheek pouches can hold about one stomach-sized amount of food.
These pouches extend down side of neck. Lives in groups of 5-25 individuals usually with an older male as leader. Each group has a well-defined social order where each member has a specific rank. Rank order can change with age or as animals join or leave troop. Males establish hierarchy based on outcome of competitive interaction.