The lower legs are gray. The tail is brownish on top at the base, darkening to black at the tip, with a white underside. The head to rump length is 14 to 18 inches. The tail is two feet. The weight is six to eight pounds.
All guenons are diurnal.
Their troops number between 10 and 40 individuals. Only the females are permanent members of the groups as males emigrate at puberty, either staying solitary, joining another mixed sex group or forming an all male group. Troops of guenons tend to be territorial. Some studies seem to indicate that when conflicts with other groups occur, the females and young are more actively involved than the males, although males may give loud calls. They rarely defend themselves, but do make threats to intruders, including man.