This species is found in montane and medium elevation forests. Preuss's monkey spends most of the time in the top levels of the forest. Preuss's monkey consumes fruits, leaves, seeds, flowers, and arthropods. This an arboreal species. Preuss's monkey has a unimale social group that occasionally has extra-group males.
Male competition is high when there are extra-group males.
Only one male gets to copulate with all of the females. This species has a polygynous mating system. Preuss's monkey gives birth to a single offspring. Burton, F. 1995. The Multimedia Guide to the Non-human Primates .