About the Authors

Barbara Tiddi

Roles Conceptualization, Formal analysis, Funding acquisition, Investigation, Methodology, Writing – original draft, Writing – review & editing

batiddi@gmail.com

Affiliations Cognitive Ethology Laboratory, German Primate Center, Göttingen, Germany, Department of Behavioral Ecology, Johann-Friedrich-Blumenbach Institute for Zoology and Anthropology, Georg-August Universität Göttingen, Göttingen, Germany

Michael Heistermann

Roles Data curation, Methodology, Writing – original draft, Writing – review & editing

Affiliation Endocrinology Laboratory, German Primate Center, Göttingen, Germany

Martin K. Fahy

Roles Data curation, Investigation

Affiliation CERCOPAN Nigeria, Calabar, Cross River State, Nigeria

Brandon C. Wheeler

Roles Conceptualization, Methodology, Writing – original draft, Writing – review & editing

Affiliation School of Anthropology & Conservation, University of Kent, Canterbury, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.