Behavior
The olive colobus monkey is a very cryptic and shy animal, which can make the observation and understanding of its behavior difficult. What is known about interactions between olive colobus monkeys and other related species shows that their social structure is very complex. Olive colobus monkeys are found in small groups containing multiple breeding males, several females, and their infants. Though found in groups of only a few individuals, olive colobus monkeys are almost always seen in association with other Cercopithecus monkeys, particularly the Diana monkey. There have been many suggestions as to how this relationship benefits the olive colobus, such as reducing the risk of predation. A piece of evidence that gives support to this idea is the willingness of the olive colobus to travel to higher altitudes in the tree tops to feed when other species are nearby.
In addition to serving as a means of predator avoidance, the close association with Diana monkeys is a mechanism used by male olive colobus monkeys to obtain new female mates. The olive colobus mating system is unique in that unlike many species living in small groups, there is no evidence of male monopolization over females. It has been proposed that females use aspects of their reproductive biology(long receptive periods, promiscuous mating, and mating overlap among females) along with mating behaviors to limit the monopolization of males in a group. Benefits to the avoidance of male monopolization include direct or indirect female mate choice, decreasing the risk of infanticide, and increased paternal care for offspring.
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