1. Department of ZoologyUniversity of Oxford New Radcliffe House, Radcliffe Observatory Quarter, Woodstock Road Oxford OX2 6GG U.K.
2. Department of Food and Resource Economics & Center for Macroecology, Evolution and ClimateUniversity of Copenhagen Rolighedsvej 23, 1958 Copenhagen Denmark
3. Durrell Institute of Conservation and Ecology, School of Anthropology and ConservationUniversity of Kent Canterbury Kent, CT2 7NZ U.K.
4. Balfour Beatty 5 Churchill Place, Canary Wharf London E14 5HU U.K.