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By: Seguin, J F - Bayle, Patrick. - Thibault, Jean-Claude - Torre, José - Vigne, Jean-DenisType: ArticleIn: The journal of raptor researchVolume: 32Series:Issue: 4Date: 1998Page Range: 314--318Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: