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The top documents tagged [hollow quill]
Phylum: Chordata Class: Aves (Birds). Classification Kingdom Animalia ---Phylum Chordata ------Subphylum Vertebrata ---------Class Aves Aviation = flight
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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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