1. Wildlife Conservation Society, Global Conservation Program, 2300 Southern Boulevard, Bronx, New York, NY 10460, USA.
2. Faculty of Natural Sciences, University of Stirling, Stirling FK9 4LA, Scotland, UK.
3. Department of Biology, Saint Louis University, Macelwane Hall, St. Louis, MO 63108, USA.
4. Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany.
5. Conservation International, 2011 Crystal Drive, Suite 500, Arlington, VA 22202, USA.
6. Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES)–Monitoring the Illegal Killing of Elephants (MIKE), MIKE Subregional Office, Yaoundé, BP 5506, Cameroon.
7. World Wildlife Fund International, Regional Office for Africa, BP 6776 Yaoundé, Cameroon.
8. Instituto Nacional de Desarrollo Forestal y Gestión del Sistema Nacional de Áreas Protegidas, Bata, Equatorial Guinea.
9. Robert Bosch Junior Professor, German Centre for Integrative Biodiversity Research (iDiv), Halle-Leipzig-Jena, Leipzig, Germany.
10. The Jane Goodall Institute, 1595 Spring Hill Road, Suite 550, Vienna, VA 22182, USA.
11. Lester E. Fisher Center for the Study and Conservation of Apes, Lincoln Park Zoo, 2001 North Clark Street, Chicago, IL 60614, USA.
12. Department of Anthropology, Washington University, 1 Brookings Drive, St. Louis, MO 63130, USA.