1. Language and Intelligence SectionPrimate Research Institute, Kyoto University Aichi 484‐8506 Japan
2. Primate Models for Behavioural Evolution LabInstitute of Cognitive and Evolutionary Anthropology, University of Oxford Oxford OX2 6PN UK
3. Interdisciplinary Centre for Archaeology and the Evolution of Human Behaviour (ICArEHB)University of Algarve 8005‐139 Faro Portugal
4. Centre for Functional Ecology, University of CoimbraCalçada Martim de Freitas 3000‐456 Coimbra Portugal