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By: Fyfe, Richard W. - Banasch, Ursula - Benavides, Virgilio - de Benavides, Nancy Hilgert - Luscombe, Anthony - Sánchez, Julio E.Type: ArticleIn: The Canadian field-naturalistVolume: 104Series:Issue: 2Date: 1990Page Range: 285--292Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects: