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By: Holthuijzen, A M A - Duley, P A - Hager, Joan C. - Smith, S A - Wood, Kristin N.Type: ArticleIn: The journal of raptor researchVolume: 21Series:Issue: 1Date: 1987Page Range: 32--33Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Gaston, Anthony J - Smith, S AType: ArticleIn: The Canadian field-naturalistVolume: 101Series:Issue: 1Date: 1997Page Range: 49--55Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects: