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. 2019 Jul 8;9:9849. doi: 10.1038/s41598-019-46322-5

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© The Author(s) 2019

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Schematic representation of the experimental apparatus. Visually naïve domestic chicks were placed in the running wheel and were free to run for 30 min towards one or the other stimuli, which were constantly rotating at the ends of the runway. The ‘stuffed fowl’ resembled the static configurations of a conspecific and the control stimulus was a ‘texture fowl’ (i.e., small pieces of an identical stuffed jungle fowl affixed in a scrambled fashion to the sides of a box). The behavior was monitored from above through a video camera and the sum of rotations in one or the other direction was recorded by an automated system.