The brutal elimination of a rival among captive male chimpanzees |
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| Affiliation: | 1. Department of Biology, Gilbert Hall, Stanford University, Stanford, CA 94305, USA;2. Max Planck Research Group Modeling the Evolution of Aging, Max Planck Institute for Demographic Research, Konrad-Zuse Str. 1, 18057 Rostock, Germany;3. Department of Biological Sciences, University of South Carolina, Columbia, SC 29208, USA;1. Mohammed VI Teaching Hospital, Cadi Ayyad University, Medical School of Marrakech, Pediatric Intensive Care Medicine, Mother and Child Hospital, Marrakach, Morocco;2. Mohammed VI Teaching Hospital, Cadi Ayyad University, Medical School of Marrakech, Laboratory of Microbiology, Mother and Child Hospital, Marrakach, Morocco;1. College of Life Sciences, Qufu Normal University, 57 Jingxuan West Road, Qufu, 273165, China;2. State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, Beijing, 100101, China;1. Division of Urology, John H. Stroger Jr. Hospital of Cook County, Chicago, Illinois;2. Department of Urology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois |
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| Abstract: | The relationships among three adult male chimpanzees (Pan troglodytes) were observed over a period of 6 years. The males were members of a large, mixed colony of chimpanzees at Arnhem Zoo (Netherlands). In spite of several power takeovers and coalition changes among the males, aggression was restrained during most of the period. This article analyzes a dramatic exception, which occurred after months of instability in the coalition network. At night, the alpha male was attacked and fatally injured in the sleeping quarters. The incident is discussed against the background of the complex balance of power among the males, especially the discrepancy between coalitions serving hierarchical status and coalitions serving sexual competition. Quantitative data support most of the hypotheses. |
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