About the Authors

E. Tobias Krause

Contributed equally to this work with: E. Tobias Krause, Barbara A. Caspers

tobias.krause@uni-bielefeld.de

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

Barbara A. Caspers

Contributed equally to this work with: E. Tobias Krause, Barbara A. Caspers

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

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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