1. Global Mammal Assessment program, Department of Biology and Biotechnologies; Sapienza Università di Roma, Viale dell'Università 32; I-00185 Rome Italy
2. Computational Science Laboratory; Microsoft Research; 21 Station Road Cambridge CB1 2FB UK
3. United Nations Environment Programme World Conservation Monitoring Centre; 219 Huntingdon Road Cambridge CB3 0DL UK
4. BirdLife International; Wellbrook Court; Cambridge CB3 0NA UK