About the Authors

Amanda D. Melin


Affiliations Department of Anthropology, Washington University in St. Louis, St. Louis, Missouri, 63130, United States of America, Departments of Anthropology & Archaeology and Cell Biology & Anatomy University of Calgary, Calgary, Alberta T2N 1N4, Canada

Donald W. Kline

Affiliation Departments of Psychology and Surgery (Ophthalmology), University of Calgary, Calgary, Alberta T2N 1N4, Canada

Chihiro Hiramatsu

Affiliation Department of Human Science, Faculty of Design, Kyushu University, Fukuoka, 815–8540, Japan

Tim Caro

Affiliation Department of Wildlife, Fish and Conservation Biology, University of California Davis, Davis, California 95616, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ADM TC. Performed the experiments: DWK TC ADM. Analyzed the data: DWK ADM CH. Contributed reagents/materials/analysis tools: ADM DWK CH. Wrote the paper: ADM TC DWK CH.