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By: Vasconcelos, Marcelo Ferreira de - Lopes, Leonardo Esteves - Hoffmann, Diego - Silveira, Luis Fabio - Schunck, FabioType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 128Series:Issue:Date: 2008Page Range: 57--67Publication Info: London, British Ornithologists' Club, 1893-Subjects: