Pablo Capilla-Lasheras,^1,2,3 Robyn J. Womack,² Ciara L. O. McGlade,⁴ Claire J. Branston,^2,5 Davide M. Dominoni,² Barbara Helm<sup>1,2,*

1</sup>Swiss Ornithological Institute, Bird Migration Unit, 6204 Sempach, Switzerland
²School of Biodiversity, One Health and Veterinary Medicine, University of Glasgow, Glasgow, UK
³Doñana Biological Station, Spanish National Research Council (EBD-CSIC), Sevilla 41092, Spain
⁴School of Biological Sciences, Queen's University Belfast, Belfast, U.
⁵School of Health and Life Sciences, University of the West of Scotland, Lanarkshire, UK

^*Corresponding author. E-mail: barbara.helm@vogelwarte.ch