Males are gray with pale faces, red cheeks and beard.
Females have brown backs, dark faces, white cheeks and beards.
They are 12-14 in. They weigh 4-4.5 lbs. Diurnal for the part of the year in which they feed on fruit and new leaves. In the dry season, when fruit and new leaves are not available, they become nocturnal and feed on nectar. Occasionally older offspring remain with their parents for a time after puberty.