1. Faculty of Biology, Department of Cell Biology Adam Mickiewicz University Uniwersytetu Poznańskiego 6 Poznań Poland
2. Department of Ecology Swedish University of Agricultural Sciences Uppsala Sweden
3. Institute of Nature Conservation Polish Academy of Sciences Kraków Poland
4. Department of Zoology Poznań University of Life Sciences Poznań Poland
5. Konrad Lorenz Institute of Ethology University of Veterinary Medicine Vienna Wien Austria
6. Faculty of Biology, Department of Behavioural Ecology Adam Mickiewicz University Poznań Poland