About the Authors
Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom
Department of Zoology, University of Otago, Dunedin, New Zealand
Evolutionary Genetics, Max Planck Institute for Ornithology, Seewiesen, Germany
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JS SN IC TB. Performed the experiments: SN IC. Analyzed the data: JS. Contributed reagents/materials/analysis tools: TB SN. Wrote the paper: JS IC SN TB.