About the Authors

Jan Hušek

jan.husek@bio.uio.no

Affiliation Centre of Ecological and Evolutionary Synthesis (CEES), Department of Biology, University of Oslo, Oslo, Norway

Karel Weidinger

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

Peter Adamík

Affiliations Department of Zoology and Laboratory of Ornithology, Palacký University, Olomouc, Czech Republic, Museum of Natural History, Olomouc, Czech Republic

Tore Slagsvold

Affiliation Centre of Ecological and Evolutionary Synthesis (CEES), Department of Biology, University of Oslo, Oslo, Norway

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JH KW PA. Analyzed the data: JH. Contributed reagents/materials/analysis tools: JH KW PA TS. Wrote the paper: JH. Provided editorial advice: KW PA TS.