The Sanje mangabey (Cercocebus sanjei) is a highly endangered Old World monkey of the White-eyelid mangabey group from Tanzania. They are about 50-65 centimeters long, excluding tail, and weigh about 7-9 kilograms. Body color is greyish. It lives in valley forests. Fruit makes up about 70% of their diet, while foliage makes up most of the rest.
