Flight heights obtained from GPS versus altimeters influence estimates of collision risk with offshore wind turbines in Lesser Black-backed Gulls Larus fuscus by Daniel T. Johnston, Chris B. Thaxter, Philipp H. Boersch-Supan, Jacob G. Davies, Gary D. Clewley, Ros M. W. Green, Judy Shamoun-Baranes, Aonghais S. C. P. Cook, Niall H. K. Burton, Elizabeth M. Humphreys

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