About the Authors
- Kimberley J. Hockings, James R. Anderson
- Department of Psychology, University of Stirling, Stirling, Scotland
- Tatyana Humle
- Department of Psychology, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
- Dora Biro
- Department of Zoology, University of Oxford, Oxford, United Kingdom
- Claudia Sousa
- Department of Anthropology, New University of Lisbon, Lisbon, Portugal
- Gaku Ohashi, Tetsuro Matsuzawa
- Primate Research Institute, Kyoto University, Kyoto, Japan
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JA KH. Performed the experiments: KH DB TH CS GO. Analyzed the data: KH. Contributed reagents/materials/analysis tools: TM KH. Wrote the paper: JA KH. Other: Editorial contributions: TM CS DB TH.