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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 treatment series of the interval experiment. Each segment corresponds to the colour (yellow = bright white, orange = dimmed white, black = light off) and duration for which the light was on (or off). In the experimental pairs, we turned the light on and off for different lengths of time (1-, 10- and 20-min intervals). In the control pairs we turned the light off for two consecutive intervals (‘light-off’, ‘light-off’). (B) Two example days, 15th and 16th June 2018, of the interval experiment. The graphs show the count of birds per minute against time. Different colour bars represent different settings (bright white, dimmed white and control) and the two dot colours represent light on (yellow) and off (black). White bars represent breaks in the experiment caused mainly by switching to a new recording or by technical mistakes.