Birds are a group of warm-blooded vertebrates constituting the class Aves, characterized by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. There are about ten thousand living species. Birds have wings whose development varies according to species; the only known groups without wings are the extinct moa and elephant birds. Wings, which evolved from forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in some birds, including ratites, penguins, and diverse endemic island species.
Fan Casting
Bean the Dynamite
Old Man Owl
Jet the Hawk
Wave the Swallow
Storm the Albatross
Longclaw
Robin (Sonic the Hedgehog)
Great Battle Kukku
Doctor Fukurokov
Sir Lamorak (Jet the Hawk)
Tekno the Canary
Scratch
Grounder
Bow Sparrow
Alan Quail
Cinder the Pheasant
Nite the Owl
Don the Rooster
Flip the Penguin
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