About the Authors
- Barbara Helm
-
*To whom correspondence should be addressed. E-mail: helm@orn.mpg.de
Affiliation Max Planck Institute for Ornithology, Andechs, Germany
- Eberhard Gwinner
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† Deceased.
Affiliation Max Planck Institute for Ornithology, Andechs, Germany
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
BH and EG conceived and designed the experiments. BH and EG performed the experiments. BH analyzed the data. BH and EG contributed reagents/materials/analysis tools. BH wrote the paper.