About the Authors

Herman Pontzer
Department of Anthropology, Washington University, St. Louis, Missouri, United States of America

Vivian Allen, John R. Hutchinson
Structure and Motion Laboratory, Department of Veterinary Basic Sciences, The Royal Veterinary College, London, United Kingdom

Corresponding Author

hpontzer@artsci.wustl.edu

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: HP JH. Performed the experiments: HP JH. Analyzed the data: HP JH. Contributed reagents/materials/analysis tools: VA. Wrote the paper: HP VA JH.