About the Authors

Alfréd Trnka

Affiliation Department of Biology, University of Trnava, Trnava, Slovakia

Pavol Prokop

Affiliations Department of Biology, University of Trnava, Trnava, Slovakia, Institute of Zoology, Slovak Academy of Sciences, Bratislava, Slovakia

Tomáš Grim

tomas.grim@upol.cz

Affiliation Department of Zoology and Laboratory of Ornithology, Palacký University, Olomouc, Czech Republic

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: AT PP. Performed the experiments: AT PP. Analyzed the data: TG. Contributed reagents/materials/analysis tools: AT TG. Wrote the paper: TG. Contributed to the final version of the manuscript: TG AT.