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dc.contributor.authorSchrauf, Cornelia
dc.contributor.authorCall, Josep
dc.contributor.authorFuwa, Koki
dc.contributor.authorHirata, Satoshi
dc.identifier.citationSchrauf , C , Call , J , Fuwa , K & Hirata , S 2012 , ' Do Chimpanzees Use Weight to Select Hammer Tools? ' , PLoS ONE , vol. 7 , no. 7 , 41044 .
dc.identifier.otherPURE: 104084193
dc.identifier.otherPURE UUID: bb08a7fb-9927-472f-8f5f-3287c367f279
dc.identifier.otherWOS: 000306548900070
dc.identifier.otherScopus: 84864014063
dc.identifier.otherORCID: /0000-0002-8597-8336/work/37477780
dc.descriptionThis study was financially supported by a Japan Society for the Promotion of Science Predoc Grant ( to Cornelia Schrauf. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.en
dc.description.abstractThe extent to which tool-using animals take into account relevant task parameters is poorly understood. Nut cracking is one of the most complex forms of tool use, the choice of an adequate hammer being a critical aspect in success. Several properties make a hammer suitable for nut cracking, with weight being a key factor in determining the impact of a strike; in general, the greater the weight the fewer strikes required. This study experimentally investigated whether chimpanzees are able to encode the relevance of weight as a property of hammers to crack open nuts. By presenting chimpanzees with three hammers that differed solely in weight, we assessed their ability to relate the weight of the different tools with their effectiveness and thus select the most effective one(s). Our results show that chimpanzees use weight alone in selecting tools to crack open nuts and that experience clearly affects the subjects' attentiveness to the tool properties that are relevant for the task at hand. Chimpanzees can encode the requirements that a nut-cracking tool should meet (in terms of weight) to be effective.
dc.relation.ispartofPLoS ONEen
dc.rights© 2012 Shrauf et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.en
dc.subjectSTONE HAMMERSen
dc.titleDo Chimpanzees Use Weight to Select Hammer Tools?en
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Psychology and Neuroscienceen
dc.contributor.institutionUniversity of St Andrews.Centre for Social Learning & Cognitive Evolutionen
dc.description.statusPeer revieweden

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