About the Authors

Marietta Dindo

Affiliations Centre for Social Learning and Cognitive Evolution, School of Psychology, University of St Andrews, Fife, United Kingdom, Living Links, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, United States of America

Andrew Whiten

aw2@st-andrews.ac.uk

Affiliation Centre for Social Learning and Cognitive Evolution, School of Psychology, University of St Andrews, Fife, United Kingdom

Frans B. M. de Waal

Affiliation Living Links, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MD AW FBMdW. Performed the experiments: MD. Analyzed the data: MD. Wrote the paper: MD AW FBMdW. Made the monkeys available and provided additional logistical support: FdW.