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: Carinatae, including all existing flying birds; Ratitae, including the ostrich and allies, the apteryx, and the extinct moas; Odontornithes, or fossil birds with teeth.
Origin: L, pl. Of avis bird.
(01 Mar 1998)
|Bookmark with:||word visualiser||Go and visit our forums|