PsittaciformesBeakFeathersBird DiseasesCircovirusCircoviridae InfectionsCockatoosParrotsChicken anemia virusNewcastle disease virusFoot-and-Mouth Disease VirusBorna disease virusInclusion Bodies, ViralCrop, AvianInfectious bursal disease virusAphthovirusFoot-and-Mouth DiseaseNewcastle DiseaseHemorrhagic Disease Virus, RabbitMarek DiseaseBorna DiseasePhylogenyDNA, ViralChickensRNA VirusesBirdsMardivirusVirus ReplicationBorder disease virusBirnaviridae InfectionsVirus CultivationChick EmbryoAleutian Mink Disease VirusVaccinia virusReceptors, VirusViral ProteinsViruses, UnclassifiedRNA, ViralHemorrhagic Disease Virus, EpizooticAntigens, Viral