About the Authors

Randi H. Griffin

Contributed equally to this work with: Randi H. Griffin, Gabriel S. Yapuncich

randi.griffin@duke.edu (RHG); gabriel.yapuncich@duke.edu (GSY)

Affiliation Department of Evolutionary Anthropology, Duke University, Durham, North Carolina, United States of America

Gabriel S. Yapuncich

Contributed equally to this work with: Randi H. Griffin, Gabriel S. Yapuncich

randi.griffin@duke.edu (RHG); gabriel.yapuncich@duke.edu (GSY)

Affiliation Department of Evolutionary Anthropology, Duke University, Durham, North Carolina, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RHG GSY. Performed the experiments: RHG GSY. Analyzed the data: RHG GSY. Wrote the paper: RHG GSY. Wrote the code used in analysis: RHG.