About the Authors
Department of Anthropology, Washington University, St. Louis, Missouri, United States of America
Structure and Motion Laboratory, Department of Veterinary Basic Sciences, The Royal Veterinary College, London, United Kingdom
The authors have declared that no competing interests exist.
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.