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. 2016 May 3;7:612. doi: 10.3389/fpsyg.2016.00612

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Copyright © 2016 Naud, Chailleux, Kestens, Bret, Desjardins, Petit, Ngoubangoye and Sueur.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Histogram of the average number of individuals observed during each period. 12:00 is considered in the morning period (am) in this figure. The bar plot was realized with the ggplot2 package (Wickham, 2009).