BOUNDARY PATROLS AND INTERGROUP ENCOUNTERS IN WILD CHIMPANZEES by DAVID P. WATTS 1,2) and JOHN C. MITANI 3,4,5) ( 1 Dept. of Anthropology, Yale University, P.O. Box 208277, New Haven, CT, USA 06520-8277; 3 Dept. Of Anthropology, The University of Michigan, 1020 LSA Bldg. Ann Arbor, MI, USA 48109) (Acc. 22-XI-2000) Summary Chimpanzees are among the few mammals that engage in lethal coalitionary aggression between groups. Most attacks on neighbors occur when parties made up mostly of adult males patrol boundaries of their community’s range. Patrols have time, energy, and opportunity costs, and entail some risks despite the tendency of males to attack only when they greatly outnumber their targets. These factors may lead to a collective action problem. Potential bene ts include protection of community members, particularly infants; range expansion and increases in the amount and quality of food available; and incorporation of more females into the community. Males may not share these equally; for example, those able to obtain 2) E-mail address: email@example.com 4) E-mail address: firstname.lastname@example.org 5) We thank The Uganda Wildlife Authority, Makerere University, and Drs. John Kasenene and Gilbert Isibirye-Basuta for permission to work at the Makerere University Biological Field Station. We thank
Behaviour – Brill
Published: Jan 1, 2001
Keywords: COLLECTIVE ACTION; CHIMPANZEES; BOUNDARY PATROLS; INTERGROUP AGGRESSION; COOPERATION
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