About the Authors
- Zanna Clay
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Affiliations School of Psychology, University of St Andrews, St Andrews, Scotland, United Kingdom, Twycross Zoo, Twycross, Atherstone, United Kingdom
- Klaus Zuberbühler
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* E-mail: kz3@st-andrews.ac.uk
Affiliation School of Psychology, University of St Andrews, St Andrews, Scotland, United Kingdom
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: KZ ZC. Performed the experiments: ZC. Analyzed the data: ZC. Contributed reagents/materials/analysis tools: KZ. Wrote the paper: KZ ZC.