Tail length about 5.2 to 7.6cm. Males about 25kg. Females about 11.5kg. Semi-terrestrial, group sizes vary from 14 to 200. Groups are comprised of single male units of about 20 animals.
Groups range in a fairly restricted area.
From the Cross River in Nigeria to the Sanaga River in southern Cameroon. Habitat destruction and hunting. Extensive selective logging and forest clearance throughout its range in Cameroon. Reafforestation has involved the planting of non-palatable exotic species such as Eucalyptus and Gemlina ar borea . The level of hunting in 1975 threatened the survival of the species.