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By: Sánchez González, Luis Antonio - Navarro-Sigüenza, Adolfo G. (Adolfo Gerardo) - Peterson, A Townsend - Garcia-Moreno, JaimeType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 127Series:Issue:Date: 2007Page Range: 34--49Publication Info: London, British Ornithologists' Club, 1893-Subjects: