Dictionary of Human Evolution and Biology

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Male-male Cooperation

Behavior in which two or more males act together to improve their chances of reproducing. Often these males are kin, but not always. An example is two langur bachelor males forming an alliance in order to oust a harem male; olive baboon males may assist one another by diverting the attention of a consort male while one sneaks in to copulate, an act considered to be a case of reciprocal altruism because it is unlikely these individuals are related.

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