About the Authors

Eduardo Fernandez-Duque

eduardof@sas.upenn.edu

Affiliations Department of Anthropology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America, Centro de Ecología Aplicada del Litoral, Conicet, Argentina

Maren Huck

Address Current address: Department of Behavioural Ecology and Sociobiology, German Primate Centre, Göttingen, Germany

Affiliation Department of Anthropology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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