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. 2017 Jun 29;7:4376. doi: 10.1038/s41598-017-04794-3

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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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Correlation between cuckoo population trend and overall trend of bird populations (left panel) and cuckoo climate suitability trend (CST) and overall CST of birds (right panel) in ten European countries. The bird population trends and bird CST in Europe were obtained from Stephens et al.¹⁴. The lines are linear regression lines and 95% confidence intervals.