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By: Giese, Alan R - Forsman, E DType: ArticleIn: The journal of raptor researchVolume: 37Series:Issue: 2Date: 2003Page Range: 117--124Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Forsman, Eric D - Giese, Alan RType: ArticleIn: The Wilson bulletinVolume: 109Series:Issue: 1Date: 1997Page Range: 28--41Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects: