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By: Cuervo, Andrés M - Stiles, F Gary - Cadena, Carlos Daniel - Toro, Juan Lazaro - Londono, Gustavo AType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 123Series:Issue:Date: 2003Page Range: 7--24Publication Info: London, British Ornithologists' Club, 1893-Subjects: