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By: Clark, Tim W. - Bekoff, Marc - Campbell, Thomas M., - Hauptman, Tedd - Roberts, Bay DType: ArticleIn: The Canadian field-naturalistVolume: 103Series:Issue: 3Date: 1989Page Range: 423--425Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Roberts, Bay D - Hatch, Scott AType: ArticleIn: The Wilson bulletinVolume: 106Series:Issue: 2Date: 1994Page Range: 289--298Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects: