1. Leverhulme Centre for Human Evolutionary Studies; University of Cambridge; Cambridge CB2 1QH UK
2. Instituto Internacional de Investigaciones Prehistóricas de Cantabria; Universidad de Cantabria; Santander Spain
3. Bearded Vulture Study & Protection Group; Apdo. 43 El Pont de Suert E-25520 Lleida Spain
4. Division of Conservation Biology, Institute of Ecology and Evolution; University of Berne; Baltzerstrasse, 6 3012 Bern Switzerland