About the Authors

Henrik Brumm

brumm@orn.mpg.de

Affiliation Communication and Social Behaviour Group, Max Planck Institute for Ornithology, Seewiesen, Germany

Heather Farrington

Affiliation Department of Biological Sciences, University of Cincinnati, Cincinnati, Ohio, United States of America

Kenneth Petren

Affiliation Department of Biological Sciences, University of Cincinnati, Cincinnati, Ohio, United States of America

Birgit Fessl

Affiliations Charles Darwin Research Station, Puerto Ayora, Santa Cruz, Galápagos, Ecuador, Durrell Wildlife Conservation Trust, Jersey, Channel Islands, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: HB BF. Performed the experiments: BF. Analyzed the data: HB BF. Contributed reagents/materials/analysis tools: HB HF KP. Wrote the paper: HB. Carried out the microsatellite analysis and interpreted the genetic data: HF KP.