1. School of Information, University of California, Berkeley, Berkeley, California, USA
2. Department of Conservation Biology, University of Göttingen, Göttingen, Germany
3. Kuzikus Wildlife Reserve, Windhoek, Omaheke, Namibia
4. Army Research Office, Durham, North Carolina, USA
5. Nicholas School of the Environment, Duke University, Durham, North Carolina, USA
6. WildTrack Inc., Durham, North Carolina, USA