1. National Institute of Biology, Ljubljana, Slovenia
2. British Trust for Ornithology (Scotland), School of Natural Sciences, University of Stirling, Stirling, UK
3. Department of Agricultural Ecology and Natural Resources, Agricultural Institute of Slovenia, Ljubljana, Slovenia
4. Imperial Eagle Foundation, Eger, Hungary
5. Finnish Museum of Natural History, University of Helsinki, Helsinki, Finland
6. Oxford University Centre for the Environment, Oxford, UK
7. Naturalis Biodiversity Center, Leiden, Netherlands