Abstract
Theropithecus gclada males may live in all-male groups, one-male groups, or in isolation. They play different roles in these different groups. Two recording techniques were developed to quantify the activities and interactions of the male geladas. There was found to be a significant relationship between a male's activities and interactions and the role he plays. There were found to be patterns of activities and interactions which correspond to male roles. These are described.

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