FeathersAPACHEPsittaciformesIntensive Care Unitsbeta-KeratinsBirdsIntensive CareCritical IllnessParrotsMoltingHospital MortalityBeakBird DiseasesIntegumentary SystemPigmentationMultiple Organ FailureSeverity of Illness IndexPasseriformesDinosaursColorSepsisFossilsChick EmbryoRespiration, ArtificialFlight, AnimalLength of StayProspective StudiesPhthirapteraROC CurveSongbirds