What Is a Bird?: What Are Birds?

Birds are vertebrate animals similar to reptiles, fishes, and amphibians, but they are warm-blooded, maintaining a constant body temperature. Most birds can fly, thanks to their unique body design, including wings, powerful chest muscles, and lightweight, often hollow bones. Feathers, exclusive to birds, aid in flight and insulation. Birds reproduce by laying eggs, with young developing inside before hatching. In summary, birds are warm-blooded, flying vertebrates with wings, feathers, and egg-laying capabilities.

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