The eastern black-and-white colobus monkey, or mantled gueraza (Colobus guereza) is a species of monkey. It can be as big as over 2 ft (0.61 m) long (excluding tail) and up to 30 lb (14 kg). In the wild, they live about 20 years.
Colobus monkeys are vegetarian. They have a three-chambered stomach to help digest leaves.