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. 2022 Dec 15;12:21721. doi: 10.1038/s41598-022-25590-8

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© The Author(s) 2022

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Heart rate as a function of ambient temperature (T_a) for Nyctophilus gouldi and Syconycteris australis. Basal HR (filled circles) was recorded in the thermoneutral zone (TNZ; 29.5–34 °C). Below the TNZ, resting HR (triangles) increased linearly for both species; (A) HR (bpm) = 682.57 -14.03 (T_a), (B) HR (bpm) = 582.32 -7.34 (T_a). Bats entered torpor (filled squares) when exposed to T_a below 25 °C (Ng) and 20 °C (Sa).