Hans Bauer1, Bertrand Chardonnet2, Mark Jones3, Claudio Sillero-Zubiri4,3. 1. Wildlife Conservation Research Unit, Zoology, University of Oxford. Tubney OX13 5QL, UK. hans.bauer@zoo.ox.ac.uk. 2. African Protected Areas and Wildlife, 92210 Saint Cloud, France. 3. Born Free Foundation, Horsham, RH12 4QP, UK. 4. Wildlife Conservation Research Unit, Zoology, University of Oxford. Tubney OX13 5QL, UK.