BirdsPasseriformesSongbirdsAnimal MigrationHousing, AnimalFeathersCharadriiformesRibsFlight, AnimalAnimals, WildPsittaciformesChickensNesting BehaviorParrotsAnimals, LaboratorySpinal FusionInternal FixatorsAnseriformesRaptorsVocalization, AnimalGalliformesFalconiformesFinchesBeakSparrowsPoultry DiseasesGeeseDucksColumbidaeCloacaBird Fancier's LungFeeding BehaviorSpecies SpecificityCrowsBehavior, AnimalPhylogenyPoultrySpheniscidaeReptilesHaemosporidaEcosystemBone Demineralization, PathologicPalaeognathaeSeasonsAnimal HusbandryPopulation DensityPopulation DynamicsEnvironmentBiological EvolutionVentilationDinosaursFullerenesCoturnixOvipositionReproductionSexual Behavior, AnimalInfluenza A Virus, H5N1 SubtypeOrthopedic Fixation DevicesStarlingsAlphapapillomavirusLumbar VertebraeAnimals, ZooGeographyMammalsHoming BehaviorAnimal WelfareEnvironment, ControlledBiomechanical PhenomenaWindFossilsTreesConservation of Natural ResourcesRadarCanariesBody SizeTime FactorsLaboratory Animal ScienceThoracic WallBiodiversityProstheses and ImplantsStrigiformesAlligators and CrocodilesCockatoosTitaniumHawksClutch SizeParakeetsMoltingWingPsittacosisThoraxWest Nile virusWest Nile FeverProventriculusBone TransplantationCrop, AvianCorticosteroneSpondylosisBornaviridae