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. 2016 Feb 16;6:21249. doi: 10.1038/srep21249

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Copyright © 2016, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Migrating birds’ tracks and headings for winds east (a,b) and west (c,d) of the preferred direction of movement (PDM). The area of each sector is proportional to the frequency of directions in that sector, weighted by migration intensity (dBZ). Mean directions plotted as tick marks on the circle border, 95% confidence intervals shown as transparent rectangles behind tick marks. Mean heading and track directions were calculated from decile samples.