Alec Demitrus + Owen Smith. Avian Reptiles. Major Classes + Examples. All modern birds lie in the subclass Neornithes ( Palaeognathae ) ( Neognathae ). Habitat + Number of Species. 10,000 species All around the world . Features and Anatomy. 4 Chambered Heart
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All modern birds lie in the subclass Neornithes
4 Chambered Heart
High Metabolic Rate
No Urinary Bladder
Tubes in Lungs
Have Air Sac, Bone Air Cavities