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. 2017 Sep 4;7:10321. doi: 10.1038/s41598-017-10417-8

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© The Author(s) 2017

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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Experimental set-up and definition of Leave-taking and Reunion condition: (A) Experimental set-up: 1 = infrared camera connected to video recording device, 2 = ultrasonic microphone connected to audio recording device, 3 = infrared LED to illuminate the sleeping box, 4 = transparent plastic wall for video recording; (B) Time line for the definition of the one-minute Leave-taking (=60 seconds before a mother leaves the nest) and Reunion (=started the last 10 seconds before the mother entered the nest box and finished 50 seconds after entering) observation intervals (OI).