The Life of Animals | Patas Monkey | The Patas monkey lives in multi-female groups of up to 60 individuals (although much larger aggregations have been reported). Once juvenile males reach sexual maturity (around the age of 4 years old) They leave the group, usually joining the all-male groups. 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
There is some confusion Surrounding the number of valid subspecies, with some listing four and others listing two; the western Erythrocebus Patas Patas (Common Patas; with a black nose) and the eastern Erythrocebus Patas pyrrhonotus .