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Brush, A. H. 1990. Metabolism of cartenoid pigments in birds. The FASEB Journal. 4:2969-2977. Fox, D. L. 1962. Carotenoids of the Roseate Spoonbill. Comparative Biochemistry and Physiology 6:305-310. (Mentioned in the Retejo de la Laboratorio Cornell de Ornitologio).