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By: Capper, David R - Clay, Robert P - Madrono N., Alberto. - Mazar Barnett, Juan - Burfield, Ian J. - Esquivel, Estela Z - Kennedy, Corinne P - Perrens, Mirna - Pople, Robert GType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 121Series:Issue:Date: 2001Page Range: 23--37Publication Info: London, British Ornithologists' Club, 1893-Subjects: