1. Institute of Zoology, Poznań University of Life Sciences, Poznań, Poland
2. Department of Nature Conservation, Institute of Biology, M. Curie-Skłodowska University, Lublin, Poland
3. The Polish Society for the Protection of Birds, OTOP/BirdLife Poland, Marki, Poland
4. Department of Molecular Biology, M. Curie-Skłodowska University, Lublin, Poland