About the Authors

Natalie Cooper

ncooper@tcd.ie

Affiliations Department of Human Evolutionary Biology, Harvard University, Cambridge, Massachusetts, United States of America, School of Natural Sciences, Trinity College Dublin, Dublin, Ireland, Trinity Centre for Biodiversity Research, Trinity College Dublin, Dublin, Ireland

Jason M. Kamilar

Affiliations Department of Anatomy, Midwestern University, Glendale, Arizona, United States of America, School of Human Evolution and Social Change, Arizona State University, Tempe, Arizona, United States of America

Charles L. Nunn

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

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: NC JMK CLN. Analyzed the data: NC. Wrote the paper: NC JMK CLN.