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By: Bekoff, Marc - Ainley, David G. - Bekoff, AnneType: ArticleIn: The Wilson bulletinVolume: 91Series:Issue: 2Date: 1979Page Range: 255--270Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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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: