BirdsPasseriformesSongbirdsAnimal MigrationFeathersCharadriiformesFlight, AnimalPsittaciformesAnimals, WildParrotsAnseriformesChickensRaptorsGalliformesNesting BehaviorFalconiformesVocalization, AnimalFinchesBeakSparrowsGeeseDucksColumbidaeCloacaBird Fancier's LungPoultry DiseasesCrowsPhylogenySpecies SpecificitySpheniscidaeReptilesHaemosporidaPoultryPalaeognathaeFeeding BehaviorSeasonsBiological EvolutionEcosystemDinosaursCoturnixInfluenza A Virus, H5N1 SubtypeStarlingsAnimals, ZooGeographyPopulation DynamicsMammalsHoming BehaviorWindFossilsTreesConservation of Natural ResourcesRadarPopulation DensityCanariesReproductionBiodiversityStrigiformesAlligators and CrocodilesCockatoosHawksClutch SizeParakeetsMoltingWingSexual Behavior, AnimalBody SizePsittacosisWest Nile virusWest Nile FeverProventriculusCrop, AvianBornaviridae