About the Authors

Barbara A. Caspers

barbara.caspers@uni-bielefeld.de

Affiliation Department of Animal Behaviour, University of Bielefeld, Bielefeld, Germany

Frank C. Schroeder

Affiliation Boyce Thompson Institute and Cornell University, Ithaca, New York, United States of America

Stephan Franke

Affiliation Institute of Organic Chemistry, University of Hamburg, Hamburg, Germany

Christian C. Voigt

Affiliation Evolutionary Ecology Research Group, Leibniz Institute for Zoo and Wildlife Research, Berlin, Germany

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: BAC CCV. Performed the experiments: BAC. Analyzed the data: BAC FCS SF. Contributed reagents/materials/analysis tools: FCS SF. Wrote the paper: BAC SF FCS CCV.