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. 2018 Mar 7;8:4106. doi: 10.1038/s41598-018-22421-7

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© The Author(s) 2018

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

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Individual seasonal differences in total speed of migration per species/population. Seasonal differences in total speed of migration as the individual spring value minus its corresponding autumn value for each species/population. Positive values indicated a higher total speed of migration in spring than in autumn and negative values the opposite. The box plots show the median and 25^th and 75^th percentiles; the whiskers indicate the values within 1.5 times the interquartile range; outliers are indicated by black dots. Numbers of individual tracks per species/population are given next to the plot and the fractions of individual tracks with faster spring/autumn migration compared to autumn/spring migration are given above the corresponding sample size. Different colours indicate different bird groups (waterfowl = orange, shearwater = cyan, bustards = purple, storks = light blue, raptors = light brown, waders = light red, gulls = dark red, owls = light purple, swifts = grey, cuckoos = yellow, rollers = light beige, hoopoes = light grey, and songbirds = dark blue). Different populations/studies of the same species were distinguished by different numbers, cf. Table S1. Y-axis is on a logarithmic scale.