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. 2021 Sep 9;11:17957. doi: 10.1038/s41598-021-96423-3

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Yawn contagion in wild geladas. Yawn contagion between two alpha males belonging to two different OMUs (OMU-Sem and OMU-Cer), on the cliffs of Kundi (Ethiopia). The trigger emitted a Covered Teeth yawn (CT) (frame a; time 06:52) followed by an Uncovered Gums yawn (UG) response (frame c; time 06:56). Latency between frame a and frame c = 00:04. (Frames from video by Alessandro Gallo and Anna Zanoli, Camera: Panasonic HC-V180 Full HD optic-zoom 50x, 2csec accuracy).