About the Authors

Claudia Rutte

Affiliation Department of Behavioral Ecology, Institute of Zoology, University of Berne, Berne, Switzerland

Michael Taborsky

To whom correspondence should be addressed. E-mail: michael.taborsky@esh.unibe.ch

Affiliation Department of Behavioral Ecology, Institute of Zoology, University of Berne, Berne, Switzerland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

CR and MT conceived and designed the experiments, analyzed the data, contributed reagents/materials/analysis tools, and wrote the paper. CR performed the experiments. MT supervised the study at all stages.