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By: Whalen, David M. - Watts, Bryan D., - Johnston, David WType: ArticleIn: The journal of raptor researchVolume: 34Series:Issue: 1Date: 2000Page Range: 42--44Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Wilson, Michael D - Watts, Bryan D.,Type: ArticleIn: The Wilson bulletinVolume: 111Series:Issue: 1Date: 1999Page Range: 56--60Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Watts, Bryan D., - Byrd, Mitchell A. - Watts, Marian U.Type: ArticleIn: The journal of raptor researchVolume: 38Series:Issue: 1Date: 2004Page Range: 47--54Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: