The olive colobus monkey is primarily a folivorous species, but also eats seeds, flowers, and petioles. This species prefers to forage in the understory and the middle- canopy of the forest. Group sizes range from 10 to 15 individuals. This is a diurnal and arboreal species. The olive colobus monkey has a multimale-multifemale social structure.
Females carry their infants in their mouth for a few weeks after they are born.
The olive colobus monkey gives birth to a single offspring. Burton, F. 1995. The Multimedia Guide to the Non-human Primates . Prentice-Hall Canada Inc. Estes, R.D. 1991. The Behavior Guide to African Mammals .