Institution: | Large Animal Research Group, Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK;;Department of Population Ecology, Zoological Institute, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark;and;Centre for Ecology and Hydrology, Banchory Research Station, Hill of Brathens, Glassel, Banchory, AB31 4BY, UK |