Bird - Wikipedia
https://en.wikipedia.org/wiki/Bird
WEBBirds 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 strong yet lightweight skeleton.
DA: 94 PA: 82 MOZ Rank: 22