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Late CretaceousHoloceneRed-crested turacoshoebillwhite-tailed tropicbirdSteller s sea eagleblack crowned cranecommon peafowlMandarin duckAnna s hummingbirdAtlantic puffinsouthern cassowaryrainbow lorikeetAmerican flamingogentoo penguingreat blue heronblue-footed boobybar-throated minlaEurasian eagle-owlkeel-billed toucanCarolus LinnaeusLinnaeusClass (biology)SubclassesNeognathaePalaeognathaeclassfeatherwingBipedalismtwo-leggedwarm-bloodedeggvertebratebody plancharacterisedbeakteethOviparitylayingEggshellhard-shelledmetabolismmetabolicheartBird skeletonskeletonspecies (biology)speciesmoaextinctforelimbbird flightflyFlightless birdratitepenguinEndemism in birdsendemicAnatidaeduck familydigestive systemdigestiverespiratory systemcorvidsparrotsAnimal cognitionintelligent animalTool use by animalsmake and use toolssocial animalsocial speciesbird migrationmigratebird songsongsHelpers at the nestcooperative breedingFlocking (behavior)flockingMobbing (animal behavior)mobbingsocially monogamouspolygynypolygynouspolyandrypolyandrousBird nestnestAvian incubationincubatedpoultryGame (food)gameeggs (food)eggsmeatfeathersSongbirdparrotpetsGuanofertilizerList of fictional birdsprominently figurebird conservationprotectbirdwatchingecotourismtetrapodbee hummingbirdostrichPaleontologyfossil recordCretaceoustheropoddinosaurBirdsEvolution and classificationthumbrightArchaeopteryx lithographicaArchaeopteryx lithographicabiological classificationclassificationFrancis WillughbyJohn RayHandbook of Birds of the WorldLynx Edicionstaxonomic classificationSystema Naturaebiological classLinnaean taxonomyPhylogenetic taxonomycladeTheropodaDefinitionCrocodiliareptileArchosauriaPhylogeneticsphylogeneticallymost recent common ancestorArchaeopteryxPhilip J. CurrieAcademic PressJacques GauthierPhylocodecrown groupCrocodileTurtleLizardSnakearchosaurAvifiloplumacrocodileAvemetatarsalia=PanavesNeornithesPascal GodefroitDeinonychusapomorphy-based cladeBird flightflight8ParavesScansoriopterygidaeEosinopteryxEumaniraptoraDromaeosauridaeTroodontidaeAvialaeDinosauriadinosaursManiraptoradromaeosaurOviraptoridaeoviraptoridsLiaoningFeathered dinosaurstheropod dinosaursScience (journal)Sciencepaleontologyavialansdeinonychosaurdromaeosauridtroodontidbasal (phylogenetics)basalMicroraptorarborealNature (journal)NatureomnivoreConfuciusornis sanctusConfuciusornis sanctusLate Jurassictransitional fossilevolutionMore