The social position of the various age and sex categories within a wild troop of Cercopithecus campbellilowei has been studied, and quantitative data on the occurrence of some behavior patterns are provided. The spontaneous departure of troop members was observed 3 times in 2 years. It appeared to be correlated with the physical and social maturation of subadult males and the occurrence of the birth season.
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Hunkeler et al. (1972) studied this question.