About the Authors

Simon W. Townsend

Affiliations School of Psychology, University of St Andrews, St Andrews, Scotland, United Kingdom, Budongo Conservation Field Station, Masindi, Uganda

Tobias Deschner

Affiliation Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany

Klaus Zuberbühler

kz3@st-and.ac.uk

Affiliations School of Psychology, University of St Andrews, St Andrews, Scotland, United Kingdom, Budongo Conservation Field Station, Masindi, Uganda

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ST KZ. Performed the experiments: ST. Analyzed the data: ST. Contributed reagents/materials/analysis tools: TD. Wrote the paper: ST KZ. Other: Performed hormonal analysis: TD.