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. 2017 Sep 6;284(1862):20171026. doi: 10.1098/rspb.2017.1026

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© 2017 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 3. — Successful hook-tools build by subjects Figaro, Fini and Moneypenny in the vertical tube condition. S, session number; T, tool number; (C), control group/no experience; (E), experience group; Photograph by Solvin Zankl.