About the Authors
- Claudia Mettke-Hofmann
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* E-mail: C.C.Mettke-Hofmann@ljmu.ac.uk
Affiliations School of Natural Sciences & Psychology, Liverpool John Moores University, Liverpool, United Kingdom, Smithsonian Migratory Bird Center, National Zoological Park, Washington, D. C., United States of America
- Hans Winkler
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Affiliation Konrad-Lorenz-Institut of Ethology, Department of Integrative Biology and Evolution, University of Veterinary Medicine, Vienna, Austria
- Paul B. Hamel
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Affiliation Southern Hardwood Laboratory, U. S. Forest Service, Stoneville, Mississippi, United States of America
- Russell Greenberg
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Affiliation Smithsonian Migratory Bird Center, National Zoological Park, Washington, D. C., United States of America
Competing Interests
Claudia Mettke-Hofmann is a PLOS ONE Editorial Board member. This does not alter the authors’ adherence to all the PLOS ONE policies on sharing data and materials.
Author Contributions
Conceived and designed the experiments: CMH RG. Performed the experiments: CMH. Analyzed the data: CMH. Contributed reagents/materials/analysis tools: RG PBH HW. Wrote the paper: CMH HW PBH RG.