About the Authors

Erik Meijaard

emeijaard@pnc-int.com

Affiliations People and Nature Consulting International, Bali, Indonesia, School for Archaeology and Palaeoanthropology, Australian National University, Canberra, Australia

Kerrie Mengersen

Affiliation School of Mathematical Sciences, Queensland University of Technology, Brisbane, Australia

Damayanti Buchori

Affiliation The Nature Conservancy – Indonesia Program, Jakarta, Indonesia

Anton Nurcahyo

Affiliation Borneo Orangutan Survival Foundation, Orangutan Reintroduction Program Central Kalimantan, Palangka Raya, Indonesia

Marc Ancrenaz

Affiliation Kinabatangan Orang-utan Conservation Project, Sandakan, Sabah, Malaysia

Serge Wich

Affiliations Sumatran Orangutan Conservation Program (PanEco-YEL), Medan, Indonesia, Anthropological Institute and Museum, University of Zurich, Zurich, Switzerland

Sri Suci Utami Atmoko

Affiliations Fakultas Biologi, Universitas Nasional, Pasar Minggu, Jakarta, Indonesia, Perhimpunan Ahli dan Pemerhati Primata Indonesia (PERHAPPI), Bogor, Indonesia

Albertus Tjiu

Affiliation World Wide Fund for Nature Indonesia, Pontianak, Indonesia

Didik Prasetyo

Affiliation Perhimpunan Ahli dan Pemerhati Primata Indonesia (PERHAPPI), Bogor, Indonesia

Nardiyono

Affiliation The Nature Conservancy – Indonesia Program, Jakarta, Indonesia

Yokyok Hadiprakarsa

Affiliations The Nature Conservancy – Indonesia Program, Jakarta, Indonesia, Perhimpunan Ahli dan Pemerhati Primata Indonesia (PERHAPPI), Bogor, Indonesia

Lenny Christy

Affiliation The Nature Conservancy – Indonesia Program, Jakarta, Indonesia

Jessie Wells

Affiliation School of Biological Sciences, University of Queensland, St Lucia, Australia

Guillaume Albar

Affiliation Société d'Ornithologie de Polynésie, Taravao, Tahiti, French Polynesia

Andrew J. Marshall

Affiliation Graduate Group in Ecology, and Animal Behavior Graduate Group, Department of Anthropology, University of California Davis, Davis, California, United States of America

Competing Interests

Erik Meijaard is presently employed by People and Nature Consulting International (PNCI), but was not working for them at the time the study was conducted. The work that went into analyzing and writing up the results of this study was unpaid. PNCI had no role in the study. The affiliation with PNCI does not alter Erik Meijaard's adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: EM KM AN MA SW SUA AJM. Performed the experiments: EM KM DB AN SUA AT DP NA GA. Analyzed the data: EM KM DB AN YH LC JW. Contributed reagents/materials/analysis tools: EM KM LC JW. Wrote the paper: EM KM DB MA SW AJM.