1. Max Planck Institute for Evolutionary Anthropology; Leipzig Germany
2. Fraunhofer Institute for Digital Media Technology IDMT; Ilmenau Germany
3. Department of Computer Science; University of Bristol; Bristol UK
4. Department of Comparative Cognition; University of Neuchâtel; Neuchâtel Switzerland
5. School of Psychology and Neuroscience; University of St Andrews; St Andrews, Scotland
6. Budongo Conservation Field Station; Masindi Uganda
7. German Centre for Integrative Biodiversity Research (iDiv) Halle-Leipzig-Jena; Leipzig Germany