Collins, D. A. 1984. Spatial pattern in a troop of yellow baboons (Papio cynocephalus) in Tanzania. Animal Behaviour 32, 536-553.

Observations of adult and subadult yellow baboons (Papio cynocephalus) revealed class differences in spatial pattern both during movement and when at rest. males tended to spend slightly more time on the periphery than did females, and travelled more at the front. Positions of males reflected their association with females: younger and older adults were more peripheral, while prime adults were focal. Positions of adult females reflected their reproductive state: mothers of young infants were gregarious, but pregnant females were peripheral and travelled at the sides. Lower-ranking females were also more peripheral. These patterns are discussed in relation to male and female reproductive differences as well as to predation.