
Birds are warm-blooded vertebrates in the class Aves. They are characterized by feathers, toothless beaked jaws, and the laying of hard-shelled eggs. Birds have a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.

Birds are warm-blooded vertebrates in the class Aves. They are characterized by feathers, toothless beaked jaws, and the laying of hard-shelled eggs. Birds have a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.
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