Abstract and Summary
Behaviour patterns related to the coordination of group members and the spatial integration of the reproductive units of gelada baboons (Theropithecus gelada) were examined in order to determine how group cohesion is maintained. The dominant female tended to maintain a spatial position nearest to the male during non-social periods, where she fulfilled a pivotal role maintaining coordination between the male and the rest of his females. Females tended to strike a balance between maintaining visual contact with the male and keeping near their preferred social partners. Progressions were usually initiated by lactating females, but decisions about whether initiated leads are followed up by the unit as a whole were shared between the male and the dominant female. The male and the dominant female were also found to play an important role in maintaining the unit's spatial integrity by threatening away members of other units and by giving support to members of their own unit who were threatened by other units.