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. 2018 Dec 7;8:17721. doi: 10.1038/s41598-018-35853-y

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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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(a) Maximum daily air temperature (black line) and maximum nest-site temperature during recording (grey circles), fluctuating above and below the optimal incubation temperature (red dotted line), in January 2018 (summer) at Bimbowrie Conservation Park, South Australia. (b) Calling probability per bout in wild zebra finches in breeding and roost nests in relation to nest-site temperature (n = 177 in-nest bouts, for 40 individuals, in 21 nests). (c) Percentage of bouts where calling occurred throughout the day in two-hour intervals and corresponding average (±s.e.) nest-site temperature during recording. Numbers at the base of each bar indicate sample sizes (n of bouts) per time interval. All bouts occurred in daylight except for those in the >20 bar, which occurred after dusk.