Bird Classification and Evolution | The Canadian Encyclopedia
https://www.thecanadianencyclopedia.ca/en/article/bird-classification-and-evolution
WEBDec 9, 2007 · Birds belong to Vertebrates, the group of animals with a vertebral column. More precisely, Birds belong to the Tetrapods, the four-limbed vertebrates, which also include amphibians, mammals and all reptiles. Evolution. Archaeopteryx, the oldest bird yet discovered, is known from several fossils recovered from fine slate deposits in Germany.
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