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, snails,


Some ____ are birds:
Birds, Passerines, flightless birds, reptiles, primates, strict-herbivores, insects, angiosperms, monkeys, beetles, extinct organisms, fish, sharks, fictional creatures, beetles with horns or pincers, lizards


Not birds:
Humans, Snakes, Bees, Rotifers, Cockroaches, Worms, Annelids, Shrimp, Crocodiles, Gharials, Caimans, Ants, Canaries, Cassowaries, Emus, Kiwis, Vultures, Herons, Ducks, Sparrows, Doves, Seagulls, Sperm Whales, Platypuses, ratites, kakapos, Elephants, unicellular organisms, all marsupials except kangaroos, venus fly traps, sea turtles, all fungi except mushrooms, pacmen, termites, toads, hermit crabs, slugs, swans, eels, unicorns, Anomalocarises, domesticated animals except chickens, pokemon, dolphins, hummingbirds, red pandas, all canines except for wolves, all felines except lions or tigers, all extinct vertebrates besides mammoths and tyrannosauruses (probably), all plants except some angiosperms, rodents, all bears except grizzly bears and pandas, all wasps that are not hornets, Great White Sharks, Tiger Sharks,

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.
Creatures that have not represented groups or individuals in a tournament bracket are 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.

Angiosperms and Gymnosperms are gametophytes
Ferns are sporophytes
sporophytes and gametophytes are vascular plants
mosses are non-vascular plants

Are aquatic mammals besides blue whales birds?
Are whale sharks birds?
Are nurse sharks birds?
Are dragons birds?
Are griffons birds?
Are aquatic fictional creatures birds?
Are chameleons birds?
Are flying insects besides beetles birds?
Are beetles without horns or pincers birds?

Are birds creatures referenced in a specific piece of fictional literature (one that includes references to all birds)?