1. Behavior, Ecology, Evolution, and Systematics Section, School of Biological Sciences; Illinois State University; Normal; IL; USA
2. Department of Zoology, Faculty of Science; Charles University in Prague; Viničná 7; 128 44; Prague; Czech Republic
3. Department of Zoology and Laboratory of Ornithology, Faculty of Science; Palacký University; tř. Svobody 26; 771 46; Olomouc; Czech Republic
4. Department of Cell Biology and Genetics; Palacký University; Šlechtitelů 11; 783 71; Olomouc; Czech Republic