1. Department of Biology Behavioural Ecology and Ecophysiology Group University of Antwerp Wilrijk Belgium
2. Swiss Ornithological InstituteField Station Valais Sion Switzerland
3. Terrestrial Ecology Unit Department of Biology Ghent University Ghent Belgium
4. Agentschap Natuur en BosRegio Noord‐Limburg Brussels Belgium
5. Research Group: Zoology, Biodiversity and Toxicology Centre for Environmental Sciences Hasselt University Diepenbeek Belgium
6. Department of Geography Institute of Life, Earth and Environment (ILEE) University of Namur Namur Belgium
7. Max Planck Institute for Ornithology Seewiesen Germany