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. 2018 Jul 3;8:10062. doi: 10.1038/s41598-018-28174-7

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© The Author(s) 2018

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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Group size, and the inter-blink interval (IBI) and blink duration (BD) of individual adult males. (A) Weighted average value of the inter-blink interval of 9 adult males in 2013 and of 4 adult males in 2016. (B) Weighted average value of the blink duration of 9 adult males in 2013 and of 4 adult males in 2016. The whiskers show standard deviation of the weighted average value of adult males. The white circles indicate weighted average values of individual males. Two males, BT and TA, belonged to the AI group in both 2013 and 2016. The red and yellow circles indicate the weighted average values of BT and TA, respectively.