BirdsPasseriformesSongbirdsAnimal MigrationFeathersCharadriiformesFlight, AnimalPsittaciformesAnimals, WildChickensParrotsAnseriformesRaptorsGalliformesNesting BehaviorFalconiformesVocalization, AnimalFinchesBeakSparrowsDucksColumbidaeGeesePhylogenyCloacaSpecies SpecificityPoultry DiseasesBird Fancier's LungCrowsMolecular Sequence DataSpheniscidaeReptilesSeasonsBiological EvolutionFeeding BehaviorHaemosporidaPalaeognathaePoultryEcosystemDinosaursCoturnixTime FactorsMammalsGeographyPopulation DynamicsInfluenza A Virus, H5N1 SubtypeStarlingsBase SequenceReproductionAnimals, ZooHoming BehaviorFossilsTreesWindConservation of Natural ResourcesSequence Analysis, DNAPopulation DensityShort Bowel SyndromeRadarCanariesBiodiversityAmino Acid SequenceSexual Behavior, AnimalStrigiformesAlligators and CrocodilesBody SizeWingMoltingClutch SizeCockatoosBehavior, AnimalHawksParakeetsWest Nile virusModels, BiologicalPsittacosisWest Nile FeverProventriculusCrop, AvianEvolution, MolecularEnvironmentAnimal CommunicationBornaviridae