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Title of Journal: Anim Cogn

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Abbravation: Animal Cognition

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Springer-Verlag

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10.1007/s10506-007-9042-4

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1435-9456

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The gestural repertoire of the wild chimpanzee

Authors: Catherine Hobaiter Richard W Byrne
Publish Date: 2011/05/01
Volume: 14, Issue: 5, Pages: 745-767
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Abstract

Great ape gestural communication is known to be intentional elaborate and flexible yet there is controversy over the best interpretation of the system and how gestures are acquired perhaps because most studies have been made in restricted captive settings Here we report the first systematic analysis of gesture in a population of wild chimpanzees Over 266 days of observation we recorded 4397 cases of intentional gesture use in the Sonso community Budongo Uganda We describe 66 distinct gesture types this estimate appears close to asymptote and the Sonso repertoire includes most gestures described informally at other sites Differences in repertoire were noted between individuals and age classes but in both cases the measured repertoire size was predicted by the time subjects were observed gesturing No idiosyncratic usages were found ie no gesture type was used only by one individual No support was found for the idea that gestures are acquired by ‘ontogenetic ritualization’ from originally effective actions moreover in detailed analyses of two gestures action elements composing the gestures did not closely match those of the presumed original actions Rather chimpanzee gestures are speciestypical indeed many are ‘familytypical’ because gesture types recorded in gorillas orangutans and chimpanzee overlap extensively with 24 gestures recorded in all three genera Nevertheless chimpanzee gestures are used flexibly across a range of contexts and show clear adjustment to audience eg silent gestures for attentive targets contact gestures for inattentive ones Such highly intentional use of a speciestypical repertoire raises intriguing questions for the evolution of advanced communicationWe thank all the staff of the Budongo Conservation Field Station especially Amati Stephen and thank the BCFS project’s founder Vernon Reynolds and its current scientific director Klaus Zuberbühler for allowing us to work at the site and to use data from the project records For permission to work in Uganda we thank the Uganda National Council for Science and Technology the Presidents Office the Uganda Wildlife Authority and the Uganda Forest Authority Fieldwork of CH was generously supported by grants from the WennerGren Foundation http//wennergrenorg and the Russell Trust The thoughtful comments of three anonymous referees were useful in improving the clarity of our theory and writing


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