Affiliation: | 1. British Trust for Ornithology, Thetford, UK;2. Centre d'Ecologie et des Sciences de la Conservation, Paris, France;3. Catalan Ornithological Institute, Museu de Ciències Naturals (Zoologia), Barcelona, Spain;4. Vogeltrekstation – Dutch Centre for Avian Migration and Demography, NIOO‐KNAW, Wageningen, The Netherlands;5. Sovon – Dutch Centre for Field Ornithology, Nijmegen, The Netherlands |