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By: Navarro, J - Sánchez-Zapata, José Antonio - Carrete, Martina - Botella, Francisco - Gavrilov, Andrei - Sklyarenko, S - Donázar, José Antonio - Ceballos, Olga - Hiraldo, FType: ArticleIn: The journal of raptor researchVolume: 37Series:Issue: 3Date: 2003Page Range: 256--258Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: