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. 2018 Mar 2;8:3942. doi: 10.1038/s41598-018-22253-5

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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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Responses to acoustically appropriate songs varied with treatment and adrenocortical responsiveness. Panels marked *show significant interactions from Table 1: three-way (a,b) or two-way (c,d) interactions relative to reference (unadjusted song at control sites). Reference (unadjusted songs in control sites) shown by grey dashed line and grey-filled box plots. (a,b), Vertical lines connect playbacks for each individual. Remaining lines (model-predicted values for treatments) and symbols (one playback) are responses to unadjusted (grey) or adjusted (black) songs. (a), songs. (b), calls. (c,d), box plots showing quartiles, median and outliers (dots) by song and infrastructure type for (c), attacks. (d), wing flicks.