protoavis most primitive avian type known; extinct bird of the Triassic having bird-like jaw and hollow limbs and breastbone with dinosaur-like tail and hind limbs
sinornis sparrow-sized fossil bird of the Jurassic period to the Cretaceous period having a keeled breastbone and vestigial tail; found in China; considered possibly the second most primitive of all birds
ibero-mesornis sparrow-sized fossil bird of the Cretaceous period having a vestigial tail; found in Spain; considered possibly the third most primitive of all birds
archaeornis extinct primitive toothed bird with a long feathered tail and three free clawed digits on each wing
flightless bird,
ratite,
ratite bird flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches; cassowaries; emus; moas; rheas; kiwis; elephant birds
passeriform bird,
passerine perching birds mostly small and living near the ground with feet having 4 toes arranged to allow for gripping the perch; most are songbirds; hatchlings are helpless
nonpasserine bird chiefly arboreal birds especially of the order Coraciiformes
Birds are winged, bipedal, endothermic, egg-laying, vertebrate animals. There are around 10,000 living species, making them the most varied of tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic.
OmegaWiki Dictionary
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bird Any of the bipedal, warm-blooded vertebrates that lay eggs having wings which, for most species, enables them to fly.
bird A powered heavier-than-air aircraft with fixed wings that obtains lift by the Bernoulli effect and is used for transportation.
bird Badminton equipment consisting of a ball of cork or rubber with a crown of feathers.