Institution: | Wildlife Conservation Research Unit, Tubney House, Abingdon Road, Tubney, Oxon OX13 5QL, UK;;Anatrack Ltd, EGI, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK;;Centre for Ecology and Hydrology, Winfrith Technology Centre, Dorchester DT2 8ZD, UK;and;Department of Statistics, University of Oxford, 1 South Parks Road, Oxford OX1 3TG, UK |