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. 2017 Aug 16;7:8437. doi: 10.1038/s41598-017-08789-y

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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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The survival curve of the giant pandas meeting the first-stage criterion. (A) Cumulative proportion of young giant pandas (solid line) and older giant pandas (dashed line) that reached the criterion. (B) Cumulative proportion of giant pandas that reached the criterion in the angry group (solid line) and the happy group (dashed). (C) Cumulative proportion of giant pandas that reached the criterion when shown the upper face (solid line) and the lower face (dashed line). (D) Cumulative proportion of female giant pandas (solid line) and male giant pandas (dashed line) that reached the criterion.