What ARE birds?

Birds:

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SpoilerBird list:
Centipedes, Alligators, Bald Eagles, Penguins, Chicken, Spiders, Crows, Peacocks, Owls, Tyrannosauruses, Blue whales, Squid, kangaroo, gorillas, turtles, octopuses, roses, sunflowers, trilobites, crabs, lions, tigers, wolves, giant pandas, grizzly bears, mammoths, hornets, flying fish,


Some ____ are birds:
Birds, Passerines, flightless birds, reptiles, primates, marsupials, strict-herbivores, insects, Non-animal organisms, monkeys, flowers, angiosperms, beetles, wasps, extinct organisms, felines, fish, canines, bears, sharks,


Not birds:
Humans, Snakes, Bees, Rotifers, Cockroaches, Worms, Mice, Annelids, Shrimp, Crocodiles, Gharials, Caimans, Ants, Canaries, Cassowaries, Emus, Kiwis, Vultures, Herons, Ducks, Sparrows, Doves, Dodos, Seagulls, Sperm Whales, Platypuses, all extinct reptiles except Tyrannosaurs, ratites, kakapos, Elephants, unicellular organisms, all marsupials except kangaroos, venus fly traps, sea turtles, all fungi except mushrooms, gymnosperms, pacmen, termites, toads, hermit crabs, slugs, swans, coyotes, eels, unicorns, polar bears, brown bears, black bears, sloth bears, Anomalocarises, domesticated animals except chickens, yellow jackets, pokemon, dolphins, hummingbirds, rats, red pandas

There are 64 total types of things that are birds.

"Zoofights" while an extremely good guess are not birds.
Organisms who have never been represented in drawings are not birds.
Ghosts are not organisms so they are not birds
Some non human animals with sapience, maybe are birds
The organisms that share a taxonomical trait that is exclusive to organisms that are birds but is not simply a listing of the names of organisms that are birds are not birds.
Birds are not things that would make awesome names for sports teams.
Birds are not things which are depicted in art as having pointy teeth.
Birds are not organisms entered into a tournament bracket.

Are fictional creatures birds?
Are canines that are not wolves birds?
Are felines that are not lions or tigers birds?
Are aquatic mammals besides blue whales birds?
Are extinct vertebrates besides mammoths and tyrannosauruses birds?
Are plants that are not angiosperms birds?
Are rodents birds?
Are bears besides grizzly bears and giant pandas birds?
Are wasps that are not hornets birds?
Are great white sharks birds?
Are tiger sharks birds?
Are beetles with horns or pincers birds?
Are extant lizards birds?

Are creatures that have not represented individuals or groups in a tournament bracket birds?

I'm not sure what to think about 64, other than we almost have half of all birds.

I've tried looking up creatures in the list...but when your google results end up with just the dictionary it's time to rethink your approach.