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The top documents tagged [theropods birds]
BIRDS: CLASS AVES Chapter 27. Class Aves – Birds Birds (class Aves) are Archosaurs but almost every feature of their reptilian anatomy has undergone modification
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Birds avian dinosaurs. Phylum Chordata Subphylum Vertebrata – Class Agnatha – Class Chondrichthyes – Class Osteichthyes – Class Amphibia – Class Reptilia
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