- 1. n. pl. The class of class="def-link" href="https://vividlex.com/word/vertebrata">Vertebrata that includes the birds. Source: opted
- 2. The class of class="def-link" href="https://vividlex.com/word/vertebrata">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: Carinatæ, including all existing flying birds; Ratitæ, 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 relating to their habits. See Beak, Bird, Odontonithes. Source: webster
- 3. n. (class="def-link" href="https://vividlex.com/word/ornithology">ornithology) the class of birds Source: ecdict
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