About the Authors

Kevin E. Langergraber

To whom correspondence should be addressed. E-mail: klangerg@umich.edu

Affiliation Department of Anthropology, University of Michigan, Ann Arbor, Michigan, United States of America

Heike Siedel

Affiliation Primatology Department, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany

John C. Mitani

Affiliation Department of Anthropology, University of Michigan, Ann Arbor, Michigan, United States of America

Richard W. Wrangham

Affiliation Department of Anthropology, Harvard University, Cambridge, Massachusetts, United States of America

Vernon Reynolds

Affiliation School of Anthropology, Oxford University, Oxford, United Kingdom

Kevin Hunt

Affiliation Anthropology Department, Indiana University, Bloomington, Indiana, United States of America

Linda Vigilant

Affiliation Primatology Department, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: LV KL. Performed the experiments: KL HS. Analyzed the data: KL. Contributed reagents/materials/analysis tools: RW VR JM KL KH. Wrote the paper: KL.