About the Authors

Manfred Gahr

gahr@orn.mpg.de

Affiliation Max Planck Institute for Ornithology, Seewiesen, Germany

Reinhold Metzdorf

Affiliation Max Planck Institute for Ornithology, Seewiesen, Germany

Dieter Schmidl

Affiliation Max Planck Institute for Ornithology, Seewiesen, Germany

Wolfgang Wickler

Affiliation Max Planck Institute for Ornithology, Seewiesen, Germany

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MG. Performed the experiments: RM DS. Analyzed the data: RM. Contributed reagents/materials/analysis tools: DS WW. Wrote the paper: MG.