Institution: | 1. Max Planck Institute for Ornithology, , Radolfzell, Germany;2. University of Antwerp, Department Biology ‐ Ethology, , Antwerp (Wilrijk), Belgium;3. Animal Demography Unit, Department of Zoology, University of Cape Town, , Cape Town, South Africa;4. Eco‐Ethology Research Unit, , Lisbon, Portugal;5. Justus‐Liebig University Gie?en, Department of Animal Ecology & Systematics, , Gie?en, Germany |