A class of vertebrates that comprises the birds.
- Let's investigate the origin and evolution of flight in our representative taxa: the Pterosauria, Aves, and Chiroptera (bats).
- Hence, the possession of feathers is unique to birds and defines all members of the class Aves.
- Now that is fine, but if you want a pretty strong line of evidence to show that birds came from theropods, then add a lot of theropods to the class Aves.
Latin, plural of avis 'bird'.
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