1. Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany.
2. German Centre for Integrative Biodiversity Research, Halle-Leipzig-Jena, 04103 Leipzig, Germany.
3. Wild Chimpanzee Foundation, Deutscher Platz 6, 04103 Leipzig, Germany.
4. West Chester University, Departments of Anthropology and Sociology and Psychology, West Chester, PA 19382, USA.
5. Department of Wildlife and Range Management, Faculty of Renewable Natural Resources, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
6. Wildlife Conservation Society, 2300 Southern Boulevard, Bronx, NY 10460, USA.
7. Chimbo Foundation, Amstel 49, 1011 PW Amsterdam, Netherlands.
8. The Aspinall Foundation, Port Lympne Wild Animal Park, Hythe, Kent, UK.
9. Elephant Listening Project, Bioacoustics Research Program Cornell Lab of Ornithology, Cornell University, 159 Sapsucker Woods Road, Ithaca, NY 14850, USA.
10. Centre for Research and Conservation, Royal Zoological Society of Antwerp, B-2018 Antwerp, Belgium.
11. School of Natural Sciences, University of Stirling, FK9 4LA, Scotland, UK.
12. Agence Nationale des Parcs Nationaux, Batterie 4, BP20379, Libreville, Gabon.
13. Institute de Recherche en Ecologie Tropicale, Libreville, Gabon.
14. Royal Holloway, University of London Egham Hill, Egham, Surrey TW20 0EX, UK.
15. Royal Society for the Protection of Birds, Potton Road, Sandy SG19 2DL, UK.
16. University of Cambridge, Pembroke Street, Cambridge CB2 3QG, UK.
17. School of Human Evolution and Social Change and Institute of Human Origins, Arizona State University, 900 Cady Mall, Tempe, AZ 85281, USA.
18. Instituto Jane Goodall España, Station Biologique Fouta Djallon, Dindéfélo, Région de Kédougou, Senegal.
19. Ebo Forest Research Project, BP3055, Messa, Yaoundé, Cameroon.
20. Institute for Conservation Research, San Diego Zoo Global, Escondido, CA 92025, USA.
21. Lester E. Fisher Center for the Study and Conservation of Apes, Lincoln Park Zoo, Chicago, IL 60614, USA.
22. Korup Rainforest Conservation Society, Korup National Park, P.O. Box 36 Mundemba, SW Region, Cameroon.
23. School of Natural Sciences and Psychology, Liverpool John Moores University, Liverpool L3 3AF, UK.
24. West Chester University, Department of Psychology, West Chester, PA 19382, USA.
25. Washington University in Saint Louis, Department of Anthropology, One Brookings Drive, St. Louis, MO 63130, USA.
26. University College London, Department of Anthropology, London WC1H 0BW, UK.
27. Frankfurt Zoological Society, Bernhard-Grzimek-Allee 1, 60316 Frankfurt, Germany.
28. Terrestrial Ecology Unit, Ghent University, K.L. Ledeganckstraat 35, 9000 Ghent, Belgium.
29. Taï Chimpanzee Project, Centre Suisse de Recherches Scientifiques, BP 1301, Abidjan 01, Côte d’Ivoire.
30. Université de Neuchâtel, Institut de Biologie, 2000 Neuchâtel, Switzerland.
31. School of Psychology and Neuroscience, University of St Andrews, St Andrews, Fife KY16 9JP, Scotland, UK.