Neognaths (Neognathae) are birds within the subclass Neornithes of the class Aves. The Neognathae include virtually all living birds; exceptions being their sister taxon (Palaeognathae), which contains the tinamous and the flightless ratites. There are nearly 10,000 species of neognaths. Since the late Cretaceous period, from which the earliest fo...
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http://en.wikipedia.org/wiki/Neognathae
The Neognathae meaning new jaw) are birds . They include most flying birds plus swimming and diving birds like penguins. Neognaths evolved during the Late Cretaceous period , about 70 million years ago. They are grouped together taxonomically based on palate (jaw) structure. (Compare to Palaeognathae .)
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
One of the two Superorders of ornithurine birds; it contains all birds with a neognathous palate—one in which the vomer and basipterygoid process are reduced and a flexible joint exists between the pterygoid and palatine bones (as compared to a palaeognathous palate, which is formed by larger, more rigid bones). Neognathae includes all modern bir...
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https://academy.allaboutbirds.org/bird-academys-a-to-z-glossary-of-bird-ter
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