About the Authors

Stephen R. Frost

sfrost@uoregon.edu

Affiliation Department of Anthropology, 1218 University of Oregon, Eugene, Oregon, 97403–1218, United States of America

Christopher C. Gilbert

Affiliations Department of Anthropology, Hunter College of the City University of New York, New York, New York, 10065, United States of America, New York Consortium in Evolutionary Primatology, New York, New York, 10024, United States of America, PhD Program in Anthropology, The Graduate Center, City University of New York, New York, New York, 10016, United States of America

Kelsey D. Pugh

Affiliations New York Consortium in Evolutionary Primatology, New York, New York, 10024, United States of America, PhD Program in Anthropology, The Graduate Center, City University of New York, New York, New York, 10016, United States of America

Emily H. Guthrie

Affiliations Department of Anthropology, 1218 University of Oregon, Eugene, Oregon, 97403–1218, United States of America, Human Subjects Division, University of Washington, Seattle, Washington, 98185, United States of America

Eric Delson

Affiliations New York Consortium in Evolutionary Primatology, New York, New York, 10024, United States of America, PhD Program in Anthropology, The Graduate Center, City University of New York, New York, New York, 10016, United States of America, Department of Vertebrate Paleontology, American Museum of Natural History, New York, New York, 10024, United States of America, Department of Anthropology, Lehman College, City University of New York, Bronx, New York, 10468, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SF CG ED. Performed the experiments: SF CG KP EG ED. Analyzed the data: SF CG. Wrote the paper: SF CG KP EG ED.