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By: Duckworth, J W - Alström, Per - Davidson, Peter J. A. - Evans, Tom D. - Poole, Colin M. - Setha, Tan - Timmins, R. J.Type: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 121Series:Issue:Date: 2001Page Range: 152--182Publication Info: London, British Ornithologists' Club, 1893-Subjects: