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. 2021 Sep 23;11:18941. doi: 10.1038/s41598-021-97986-x

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© The Author(s) 2021

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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(A) Visualisation of an example of treatment series of the spectra experiment, with consecutive 1-min segments (rectangles on the figure) with the torch on and off. Each experimental pair (‘light-on’, ‘light-off’) has a coloured segment corresponding to one of five different settings (‘red’, ‘green’, ‘blue’, ‘dimmed white’ and ‘bright white’) followed by a black segment representing the light off. Two black segments indicate a control pair (‘light-off’, ‘light-off’). (B) Two example days of the spectra experiment undertaken at the Farm (19th July 2018 starting at 23:40BST) and on the Neck (23rd July 2018 at 00:07BST). They show the count of birds per minute against time. Different colours of dots represent various settings.