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. 2016 Mar 21;4:e1775. doi: 10.7717/peerj.1775

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©2016 Borgi and Majolo

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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(A) An example illustrating how fWHR was calculated from images (Barbary macaque). Bizygomatic width was measured as the horizontal distance between the left and right zygion (vertical lines); upper-face height as the vertical distance between the highest point of the eyelids and the highest point of the upper lip (horizontal lines). The fWHR was calculated as width divided by height. (B) A male rhesus macaque (dominance style 1). Photo by Lauren Brent (modified). (C) A male Tonkean macaque (dominance style 4). Photo by Bernard Thierry (modified).