Bird - Wikipedia
https://en.wikipedia.org/wiki/Bird
WebNeornithes Gadow, 1883. Birds are a group of warm-blooded vertebrates constituting the class Aves ( / ˈeɪviːz / ), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a …
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