Colobus monkeys have sacculated stomachs that help them digest leaves; leaves make up most of their diet. Colobus monkeys also eat fruit. These monekys are quadrupedal and arboreal. They are active during the day. Colobus monkey social structure conists of one male and many females. These are very territorial animals where the males emigrate. Colobus monkeys are born white, and mothers and infants are very social. Males are not.