Affiliation: | 1. British Trust for Ornithology, The Nunnery, Thetford, Norfolk, IP24 2PU, UK 2. Butterfly Conservation, Manor Yard, East Lulworth, Wareham, Dorset, BH20 5QP, UK 3. Department of Zoology, University of Cambridge, Cambridge, CB2 3EJ, UK 4. NERC Centre for Ecology & Hydrology, Wallingford, Oxfordshire, OX10 8BB, UK
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