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By: Barton, Nigel W. H. - Houston, D CType: ArticleIn: The journal of raptor researchVolume: 30Series:Issue: 4Date: 1996Page Range: 219--223Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Barton, Nigel W. H. - Houston, D CType: ArticleIn: The journal of raptor researchVolume: 35Series:Issue: 1Date: 2001Page Range: 71--73Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Barton, Nigel W. H.Type: ArticleIn: The journal of raptor researchVolume: 34Series:Issue: 1Date: 2000Page Range: 53--55Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Barton, Nigel W. H. - Fox, Nicholas C. - Surai, P F - Speake, B KType: ArticleIn: The journal of raptor researchVolume: 36Series:Issue: 1Date: 2002Page Range: 33--38Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: