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. 2019 Sep 4;5(9):eaaw0736. doi: 10.1126/sciadv.aaw0736

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Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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Fig. 5 — Top row: P. troglodytes schweinfurthii, Pan paniscus, Gorilla beringei, Pongo pygmaeus, Hylobates muelleri, and Cebus imitator. Bottom row: Papio ursinus (x2), Chlorocebus pygerythrus (x2), Eulemur macaco, and Nycticebus coucang. Image sources: Chimpanzee: www.youtube.com/watch?v=c2u3NKXbGeo; Bonobo: www.youtube.com/watch?v=JF8v_HWvfLc&t=9s; Gorilla: www.youtube.com/watch?v=wDECqJsiGqw&t=28s; Orangutan: www.youtube.com/watch?v=Gj2W5BHu-SI;Gibbon: www.youtube.com/watch?v=C6HucIWKsVc;Capuchin: Lynn Lewis-Bevan (personal data); Baboon: Lucy Baehren (personal data); Vervet monkey: Lucy Baehren (personal data); Loris: www.youtube.com/watch?v=2Syd_BUbl5A&t=2s.