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. 2021 Apr 20;6:6. doi: 10.1186/s40850-021-00071-z

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© The Author(s) 2021

Open AccessThis 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/. 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 in a credit line to the data.

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Fig. 1 — Annual cycle of four collared sand martins (Riparia riparia) breeding in north-central (DE) and south-central Europe (HU). The map gives the spatial organisation with autumn migration (brown) and spring migration (green) between the European breeding sites (red) and the sub-Saharan nonbreeding sites (blue). The underlying scatter indicates 95% credibility intervals of geolocation estimates (light grey: birds from Germany, dark grey: birds from Hungary). The green dot indicates the passage site in Greece (see main text). The insets give the temporal organisation with percentages of time for residency and migration periods (same period specific colours) and average arrival and departure for each respective period