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By: Koenen, Marcus T - Koenen, Sarah Gale - Yanez, NormaType: ArticleIn: The journal of raptor researchVolume: 34Series:Issue: 1Date: 2000Page Range: 33--36Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Koenen, Marcus T - Leslie, David M - Gregory, MarkType: ArticleIn: The Wilson bulletinVolume: 108Series:Issue: 2Date: 1996Page Range: 292--301Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects: