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Source : Webster's Revised Unabridged Dictionary (1913)

Aves \A"ves\, n. pl. [L., pl. of avis bird.] (Zo["o]l.)
   The class of Vertebrata that includes the birds.

   Note: Aves, or birds, have a complete double circulation,
         oviparous, reproduction, front limbs peculiarly
         modified as wings; and they bear feathers. All existing
         birds have a horny beak, without teeth; but some
         Mesozoic fossil birds (Odontornithes) had conical teeth
         inserted in both jaws. The principal groups are:
         {Carinat[ae]}, including all existing flying birds;
         {Ratit[ae]}, including the ostrich and allies, the
         apteryx, and the extinct moas; {Odontornithes}, or
         fossil birds with teeth.

   Note: The ordinary birds are classified largely by the
         structure of the beak and feet, which are in direct
         relation to their habits. See {Beak}, {Bird},

Source : WordNet®

     n : birds [syn: {class Aves}]
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