About the Authors

Laurel Mariah Carnes

Affiliation The Law School, University of Chicago, Chicago, Illinois, United States of America

Charles L. Nunn

Affiliation Department of Human Evolutionary Biology, Peabody Museum, Harvard University, Cambridge, Massachusetts, United States of America

Rebecca J. Lewis

rjlewis@mail.utexas.edu

Affiliation Department of Anthropology, University of Texas at Austin, Austin, Texas, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RJL CLN. Analyzed the data: CLN. Wrote the paper: LMC CLN RJL. Collected the data: LMC RJL.