FeathersMelaninsPsittaciformesMonophenol MonooxygenasePigmentationbeta-KeratinsBirdsMelanocytesMelanosomesMoltingParrotsBeakBird DiseasesSkin PigmentationIntegumentary SystemPigments, BiologicalPasseriformesColorDinosaursNaphtholsHairFossilsDihydroxyphenylalanineChick EmbryoFlight, AnimalSepiaAlbinismSkinExophialaPhthirapteraHyperpigmentationCysteinyldopaLaccase