About the Authors

Alice M. I. Auersperg
Department of Cognitive Biology, University of Vienna, Vienna, Austria

Alice M. I. Auersperg, Auguste M. P. von Bayern
Max-Planck-Institute for Ornithology, Seewiesen, Germany

Alex Kacelnik, Auguste M. P. von Bayern
Department of Zoology, University of Oxford, Oxford, United Kingdom

Corresponding Authors

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: AA, AB. Performed the experiments: AA, Constanze Riha (see acknowledgements). Analyzed the data: AA. Contributed reagents/materials/analysis tools: AA AB AK. Wrote the manuscript: AA AK AB.