About the Authors
- Margaret A. Stanton
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* E-mail: mastanton@gwu.edu
Affiliations Department of Biology, Georgetown University, Washington, D.C., United States of America, Department of Anthropology, The George Washington University, Washington, D.C., United States of America
- Janet Mann
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Affiliations Department of Biology, Georgetown University, Washington, D.C., United States of America, Department of Psychology, Georgetown University, Washington, D.C., United States of America
Competing Interests
The National Geographic Society Committee for Research and Exploration provided some funding for long-term field research. This does not alter the authors’ adherence to all the PLOS ONE policies on sharing data and materials.
Author Contributions
Conceived and designed the experiments: MAS JM. Performed the experiments: MAS JM. Analyzed the data: MAS. Contributed reagents/materials/analysis tools: MAS JM. Wrote the paper: MAS JM.