About the Authors

Oscar Vedder

oscarvedder@hotmail.com (OV); ben.sheldon@zoo.ox.ac.uk (BCS)

Affiliation Edward Grey Institute, Department of Zoology, University of Oxford, Oxford, United Kingdom

Sandra Bouwhuis

Affiliations Edward Grey Institute, Department of Zoology, University of Oxford, Oxford, United Kingdom, Institute of Avian Research, Wilhelmshaven, Germany

Ben C. Sheldon

oscarvedder@hotmail.com (OV); ben.sheldon@zoo.ox.ac.uk (BCS)

Affiliation Edward Grey Institute, Department of Zoology, University of Oxford, Oxford, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

The author(s) have made the following declarations about their contributions: Conceived and designed the experiments: BCS OV. Performed the experiments: OV SB BCS. Analyzed the data: OV SB. Wrote the paper: OV BCS.