1. Department of Behavioural Ecology and Evolutionary Genetics Max Planck Institute for Ornithology Starnberg Germany
2. Centre for Environmental Sciences, Research Group: Zoology, Biodiversity and Toxicology Hasselt University Diepenbeek Belgium
3. Department of Biology Centre for Animal Movement Research Lund University Lund Sweden
4. Agentschap Natuur en Bos Brussels Belgium
5. Wildlife Science and Conservation Center Ulaanbaatar Mongolia
6. Swiss Ornithological Institute Sempach Switzerland