The geographical range lies south of that of the mantled guereza. The mantled guereza is distributed throughout Equatorial Africa. The common chimpanzee is known to hunt the guereza. The mantled guereza lives in both deciduous and evergreen forests. The Dodinga Hills guereza hasn't been recorded since the 1960s. Allogrooming is an important part of mantled guereza interactions and mostly occurs between females. The mantled guereza has a polygynous harem-based mating system. The mantled guereza lives in social groups of three to fifteen individuals. The mantled guereza is also threatened by hunting for meat and its skin. When foraging for leaves, the mantled guereza prefers young ones over old. The mantled guereza lives in stable social groups usually containing three to fifteen members. Like most colobi, the mantled guereza has a small thumb that is vestigial. The newborn guereza relies on its mother for support and must cling to her. The mantled guereza is also threatened by hunting for bushmeat and for its skin. The mantled guereza is diurnal and arboreal, found in both deciduous and evergreen forests.