About the Authors

Jordi Galbany

jgalbany@gwu.edu

Affiliation Center for the Advanced Study of Hominid Paleobiology, Department of Anthropology, The George Washington University, Washington DC, United States of America

Jenny Tung

Affiliations Department of Evolutionary Anthropology, Duke University, Durham, NC, United States of America, Duke Population Research Institute, Duke University, Durham, NC, United States of America, Institute of Primate Research, National Museums of Kenya, Nairobi, Kenya, Department of Biology, Duke University, Durham, NC, United States of America

Jeanne Altmann

Affiliations Institute of Primate Research, National Museums of Kenya, Nairobi, Kenya, Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, United States of America

Susan C. Alberts

Affiliations Institute of Primate Research, National Museums of Kenya, Nairobi, Kenya, Department of Biology, Duke University, Durham, NC, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JG SCA. Performed the experiments: JG JA. Analyzed the data: JG SCA. Contributed reagents/materials/analysis tools: JG JT JA SCA. Wrote the paper: JG JT JA SCA. Supported the study: JA SCA.