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By: Palma, L - Mira, S - Cardia, Pedro - Beja, Pedro - Guillemaud, Thomas - Ferrand, Nuno - Cancela, M. Leonor (Maria Leonor) - Fonseca, Luís Cancela da,Type: ArticleIn: The journal of raptor researchVolume: 35Series:Issue: 3Date: 2001Page Range: 187--193Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: