What has been observed about all-male groups of nonhuman primates?

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All-male groups of nonhuman primates often exist together with multimale, multifemale groups. This is a common social structure observed in many primate species, including baboons, macaques, and chimpanzees. The all-male group may act as a "buffer" between other groups, or they may be waiting for females to join and form a new group. However, these all-male groups do not usually become permanent and do not have rigid ranking systems.

What Has Been Observed About All-Male Groups of Nonhuman Primates