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A critical analysis of the number and composition of the birds that are strictly protected by the Royal Order of 25 November 1896, in which a catalogue of legally protected species was created for the first time in Spain, has been performed. This is a list developed by a public body, one of whose members was Mariano de la Paz Graells, a remarkable 19th century Spanish naturalist. The research has been carried out on bibliographic sources and archives, and its main result is the finding of the documentary evidence that proves the linkage of this illustrious scientist with the first Spanish regulation about wildlife protection.

El primer catálogo español de especies protegidas (1896): análisis de su contenido y autoría de Graells