About the Authors

Roberta Salmi

roberta.salmi@gmail.com

Affiliations Department of Anthropology, University of Georgia, Athens, Georgia, United States of America, Interdepartmental Doctoral Program in Anthropological Sciences, Stony Brook University, Stony Brook, New York, United States of America

Kurt Hammerschmidt

Affiliation Cognitive Ethology Laboratory, German Primate Center, Göttingen, Germany

Diane M. Doran-Sheehy

Affiliation Department of Anthropology, Stony Brook University, Stony Brook, New York, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RS KH DD. Performed the experiments: RS. Analyzed the data: RS KH. Contributed reagents/materials/analysis tools: KH. Wrote the paper: RS DD. Revised the article critically: KH DD.