Reproductive Competition and Cooperation among Female Yellow Baboons**The Mikumi site and operations were supported by grants to Ramon J. Rhine from NSF (FMS74-17531 and BMS75-05732), NIMH (1 R01 MH30428), the Leakey Foundation, the Center for Social and Behavioral Sciences Research of the University of California, Riverside, and by Biomedical Sciences Support grants to the University of California, Riverside. The Department of Psychology, University of Washington, provided financial support for this project as well. · Study