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The patas monkey (Erythrocebus patas), also known as the Wadi monkey or Hussar monkey, is a ground-dwelling monkey distributed over semi-arid areas of West Africa, and into East Africa. The patas monkey lives in multi-female groups of up to 60 individuals (although much larger aggregations have been reported). There is a weak dominance rank. The group contains just one adult male for most of the year. During the breeding season, there are multi-male influxes into the group. Once juvenile males reach sexual maturity (around the age of 4 years old) they leave the group, usually joining all-male groups. The adult females in the group initiate movement of the group with the male following their lead.
The patas monkey avoids dense woodlands and lives in more open savanna and semi-deserts. The patas monkey has a remarkably high reproductive rate, perhaps as an evolutionary response to the high adult mortality rates associated with this strongly terrestrial lifestyle
San Francisco Zoo