| Document Date: 2011-10-21 18:00:11
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City Berlin / Cambridge / New York / Oxford / / Company New Caledonian Crows Alex A. S. / Wellcome Trust / A.A.S. / Leverhulme Trust / / Country United Kingdom / New Caledonia / / / Facility Scale bar / New Caledonian Crows Alex A. S. Weir / / IndustryTerm bucket containing food / hook tools / Online Material / food / / Organization Department of Zoology / Oxford Univ. / Harvard Univ. / / Person Joan Silk / Alex Kacelnik / Jackie Chappell / / Position model / / ProvinceOrState New York / Massachusetts / / URL www.sciencemag.org / www.sciencemag.org/cgi/content/full/297/5583/981 / /
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ECOLOGY AND BEHAVIOR Shaping of Hooks in New Caledonian Crows Alex A. S. Weir, Jackie Chappell, Alex Kacelnik* Many animals use tools, but their understanding of physical forces or causal relations is