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A reporting of an abnormality in the beak in a male Japanese quail, Coturnixcoturnix japonica, has been discussed in this paper. During the behavioral study of Japanese quails, a male differed markedly from the others due to its comparatively longer beak. The maxilla was abnormally elongated and curved over the mandible, which made it difficult to feed and drink.Beak deformities has been previously reported in the Antarctic Cormorant,Phalacrocoraxbransfieldensischick; White winged Becard,Pachyramphuspolychopterus; Passerines (Craves); Brown headed Cowbird; Black Wheatears, Oenantheleucura; Southern Giant Petrel, Macronectesgiganteus chick. But no such record of beak deformity in japanese quail has been studied. The reason behind this anomaly can be a subject of research.