1. Department of Animal Morphology, Faculty of Biology, Adam Mickiewicz University, Poznań Poland
2. Laboratory and Museum of Evolutionary Ecology, Department of Ecology, Faculty of Humanities and Natural Sciences, University of Presov, Prešov, Slovakia
3. Department of Avian Biology and Ecology, Faculty of Biology, Adam Mickiewicz University, Poznań Poland
4. Faculty of Biological Sciences, University of Zielona Góra, Zielona Góra, Poland