All members of the subfamily Cercopithecinae are diurnal. Most species are essentially arboreal, but there are also y >
numerous species that have become adapted for terrestrial activity. In all cases, locomotion is typically quadrupedal. All cheek-pouched monkeys live in gregarious social groups that move around and feed as relatively cohesive units, organized in some cases as harem groups with a single adult male (one-male groups) and in others as groups containing several adult males (multimale groups). Monogamy is extremely rare as a social system in cercopithecine monkeys. Forest-living guenons of the genus Cercopithecus, patas monkeys (Erythrocebus), hamadryas baboons (Papio hamadryas), and geladas (Theropithecus) all form one-male groups. In some species that exhibit one-male groups, surplus males form bachelor male groups, and it is possible for several harem groups and bachelor male groups to live in large herds, as is the case with hamadryas baboons and geladas. As a general rule, females tend to stay in their natal groups, whereas males migrate at round the time of sexual maturity.
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