This monkey lives in packs of about twelve individuals. An older female has the command of the group, and just one pubescent male is allowed to live with the pack. The monkeys feed on insects, seeds and tuberss.
There are two subspecies: the western Erythrocebus patas patas (Common patas) and the eastern Erythrocebus patas pyrrhonotus (Nisnas). The Nisnas monkey has a white nose, while the nose of the common patas monkey is black.