Birds are a group of warm-blooded vertebrates constituting the class Aves, characterised 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.

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This tag implicates avian (learn more).

The following tags implicate this tag: gull, hawk, owl, picid, and pigeon (learn more).

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