Weight at birth is around 4 lbs. Longevity is around 40 to 45 years. The main threat comes from habitat destruction, particularly commercial logging, hunting for bush meat and commercial exploitation for overseas trade. Some countries they are extinct. They travel sometimes with other communities, and may share overlapping ranges.
Males are larger and stronger than females.
They sleep in nests, made fresh every night. Usually the nests are in the tallest trees, in the crotch of branches with a leafy canopy overhead. Adults sleep alone, except when infants with their mothers.