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By: Azpiroz, Adrian B - Menendez, Jose L - Jaramillo, Alvaro - Presa, Dardo - Calimares, Carlos - Saralegui, Alvaro M. - Abente, Jose SType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 132Series:Issue: 1Date: 2012Page Range: 46--54Publication Info: London, British Ornithologists' Club, 1893-Subjects: