About the Authors

Rick Bruintjes

rbruintjes@yahoo.com

Affiliations Department of Behavioural Ecology, Institute of Ecology and Evolution, University of Bern, Hinterkappelen, Switzerland, School of Biological Sciences, University of Bristol, Bristol, United Kingdom

Danielle Bonfils

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

Dik Heg

Affiliations Department of Behavioural Ecology, Institute of Ecology and Evolution, University of Bern, Hinterkappelen, Switzerland, Institute of Social and Preventive Medicine (ISPM), University of Bern, Bern, 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: RB DH MT. Performed the experiments: RB. Analyzed the data: RB DH. Contributed reagents/materials/analysis tools: DB. Wrote the paper: RB DH MT. Performed all laboratory work: DB.