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Birds are a group of endothermic vertebrates, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.Wikipedia
...   Class: Aves; Linnaeus, 1758
Scientific name: Aves
Kingdom: Animalia
Higher classification: Ornithurae
Phylum: Chordata
Rank: Class
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Birds are a group of endothermic vertebrates, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.Wikipedia
...   : Aves; Linnaeus, 1758
Scientific name: Aves
Kingdom: Animalia
Higher classification: Ornithurae
Phylum: Chordata
Rank: Class
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