About the Authors

Dik Heg

dik.heg@iee.unibe.ch

Affiliation Department of Behavioural Ecology, Institute of Ecology and Evolution, University of Bern, Hinterkappelen, Switzerland

Michael Taborsky

Affiliation Department of Behavioural Ecology, Institute of Ecology and Evolution, University of Bern, Hinterkappelen, Switzerland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: DH MT. Performed the experiments: DH. Analyzed the data: DH. Wrote the paper: DH.