About the Authors
- Serge A. Wich
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* E-mail: sergewich1@yahoo.com
Affiliations Anthropological Institute and Museum, University of Zurich, Zurich, Switzerland, Sumatran Orangutan Conservation Programme (PanEco-YEL), Medan, Sumatra, Indonesia
- Michael Krützen
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Contributed equally to this work with: Michael Krützen, Adriano R. Lameira
Affiliation Anthropological Institute and Museum, University of Zurich, Zurich, Switzerland
- Adriano R. Lameira
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Contributed equally to this work with: Michael Krützen, Adriano R. Lameira
Affiliation Behavioural Biology, Utrecht University, Utrecht, The Netherlands
- Alexander Nater
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Affiliation Anthropological Institute and Museum, University of Zurich, Zurich, Switzerland
- Natasha Arora
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Affiliation Anthropological Institute and Museum, University of Zurich, Zurich, Switzerland
- Meredith L. Bastian
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Affiliation Department of Anthropology, Boston University, Boston, United States of America
- Ellen Meulman
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Affiliation Anthropological Institute and Museum, University of Zurich, Zurich, Switzerland
- Helen C. Morrogh-Bernard
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Affiliation University of Cambridge, Wildlife Research Group, Cambridge, United Kingdom
- S. Suci Utami Atmoko
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Affiliation Fakultas Biologi, Universitas Nasional, Jakarta, Indonesia
- Joko Pamungkas
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Affiliation Primate Research Centre, Bogor Agricultural University, Bogor, Indonesia
- Dyah Perwitasari-Farajallah
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Affiliation Primate Research Centre, Bogor Agricultural University, Bogor, Indonesia
- Madeleine E. Hardus
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Affiliation Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, The Netherlands
- Maria van Noordwijk
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Affiliation Anthropological Institute and Museum, University of Zurich, Zurich, Switzerland
- Carel P. van Schaik
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Affiliation Anthropological Institute and Museum, University of Zurich, Zurich, Switzerland
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: SW MK AL CvS. Performed the experiments: SW AL MK CvS. Analyzed the data: SW AL MK CvS NA AN. Contributed reagents/materials/analysis tools: SW MK NA AN AL EM MB HMB MH MvN JP DPF SSUA. Wrote the paper: SW AL MK CvS.