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. 2018 Oct 2;6:19. doi: 10.1186/s40462-018-0137-1

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Cumulative hours of flight of eurasian hoopoe (N = 5) and great reed wabler (N = 13) from July 2015 until April 2016. (a) Seasonal activity periods coincide with post- and pre-breeding migration in the hoopoe, while (b) reed warblers have an additional activity phase marked as intra-tropical movements