Your current chain: State of matter Life > Kingdom Animalia > Phylum Chordata > Subphylum Vertebrata > Class Aves
(From Wikipedia) 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.
FACT: Somewhat comedically, the only two types of bird known to be completely wingless, the moa and the elephant bird, are both extinct!
Currently discovered: 10/42 Orders
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