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. 2016 Jul 22;6:30187. doi: 10.1038/srep30187

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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On the x-axis, monkey individuals are divided into two groups: monkeys who never displayed huddling behaviours (n = 18) and monkeys who displayed huddling behaviours (n = 23). The y-axis displays the mean time spent in a huddled posture (seconds per hour).