About the Authors
- Esther Clarke
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Affiliation School of Psychology, University of St Andrews, St Andrews, Scotland
- Ulrich H. Reichard
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Affiliations Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany, Department of Anthropology, Southern-Illinois University, Carbondale, United States of America
- Klaus Zuberbühler
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*To whom correspondence should be addressed. E-mail: kz3@st-and.ac.uk
Affiliation School of Psychology, University of St Andrews, St Andrews, Scotland
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: KZ. Performed the experiments: EC. Analyzed the data: EC. Contributed reagents/materials/analysis tools: KZ UR. Wrote the paper: KZ EC. Other: Director of gibbon field site at Khao Yai, provided access to study site, habituated animals, provided permits and invaluable background information on the gibbons: UR.