Abstract
espanolSe discuten dos casos de posibles aberraciones cromaticas del plumaje en el Gorrion Comun Passer domesticus L., 1758 en Espana. Estos dos casos evidencian la dificultad que conlleva una buena identificacion de las diferentes aberraciones cromaticas del plumaje en aves. Una correcta identificacion de las mismas asi como conocer el numero y la distribucion de estos ejemplares es fundamental para entender los factores que determinan su aparicion en poblaciones naturales de aves EnglishTwo cases of possible plumage colour aberrations in the House Sparrow Passer domesticus L., 1758 in Spain are discussed. These two examples highlight the difficulties in correctly identifying plumage colour aberrations in birds. A correct identification of these aberrant individuals as well as information on their number and distribution would certainly expand our understanding of the factors determining their occurrence in natural bird populations. euskaraEspainian etxe-txolarre Passer domesticus L., 1758 espeziean aurkitutako lumajearen kolore alterazioko bi kasu posible eztabaidatzen dira. Bi kasu hauek agerian uzten dute zein zaila gertatzen den hegaztien lumajean agertzen diren aberrazio kromatiko desberdinak ondo identifikatzea. Horiek behar bezala antzematea eta bai ale horiek zer kopuru eta banaketa duten jakitea oso garrantzitsua da, hegaztien populazio naturaletan ager-tzeko faktore eragileak zein diren ulertu ahal izateko
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