1. Department of Comparative Cognition, University of Neuchâtel, Neuchâtel, NE, Switzerland
2. School of Pharmacy and Biomolecular Sciences, University of Brighton, Brighton, UK
3. School of Psychology and Neuroscience, University of St. Andrews, St. Andrews, UK
4. National Primate Research Center of Thailand, Chulalongkorn University, Saraburi, Thailand
5. Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
6. Department of Anthropology and Centre for Ecology, Southern Illinois University at Carbondale, Carbondale, IL, USA