About the Authors

Adriano R. Lameira

adriano@orangutan.nl

Affiliations Animal Ecology, Utrecht University, Utrecht, The Netherlands, Pongo Foundation, Oudewater, The Netherlands

Madeleine E. Hardus

Affiliations Pongo Foundation, Oudewater, The Netherlands, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, The Netherlands

Kim J. J. M. Nouwen

Affiliations Animal Ecology, Utrecht University, Utrecht, The Netherlands, Adaptation Physiology Group, Wageningen University, Wageningen, The Netherlands

Eva Topelberg

Affiliations Animal Ecology, Utrecht University, Utrecht, The Netherlands, Adaptation Physiology Group, Wageningen University, Wageningen, The Netherlands

Roberto A. Delgado

Affiliation Human and Evolutionary Biology, University of Southern California, Los Angeles, California, United States of America

Berry M. Spruijt

Affiliation Animal Ecology, Utrecht University, Utrecht, The Netherlands

Elisabeth H. M. Sterck

Affiliations Animal Ecology, Utrecht University, Utrecht, The Netherlands, Biomedical Primate Research Center, Rijswijk, The Netherlands

Cheryl D. Knott

Affiliation Department of Anthropology, Boston University, Boston, Massachusetts, United States of America

Serge A. Wich

Affiliation Research Centre in Evolutionary Anthropology and Palaeoecology, School of Natural Sciences and Psychology, Liverpool John Moores University, Liverpool, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ARL MEH SAW . Performed the experiments: KJJMN ET. Analyzed the data: ARL MEH KJJMN CDK. Contributed reagents/materials/analysis tools: ARL MEH RAD BMS EHMS CDK SAW. Wrote the manuscript: ARL RAD BMS EHMS CDK SAW.