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By: Frere, Esteban - Travaini, Alejandro - Parera, A - Schiavini, Adrian Carlos MiguelType: ArticleIn: The journal of raptor researchVolume: 33Series:Issue: 3Date: 1999Page Range: 268--269Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: