The leaf-clipping display: A newly-discovered expressive gesture in wild chimpanzees |
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Authors: | T. Nishida |
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Affiliation: | Department of Anthropology, Faculty of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113, Japan |
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Abstract: | Chimpanzees of the Mahale Mountains, Tanzania were discovered to show an expressive gesture using leaves, termed as “leaf-clipping display”. This behavioural signal is directed by an adult male to an estrous female as a possessive behaviour, or by an adolescent male as a courtship display, or by an estrous female to an adolescent male also as a solicitation of copulation. The signal also is used toward human observers as a signal of food-demanding. This behaviour pattern might originate in a displacement tool-making behaviour in conflict situations. The leaf-clipping display has not been observed in any other chimpanzee populations studied, and may probably be one example of the tradition drift in wild chimpanzees. |
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Keywords: | chimpanzee courtship frustration displacement activity ritualization tradition |
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