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Planet Earth

Did dinos evolve flight twice?

A new fossil suggests dinosaur flight evolved once in bird ancestors and again in prehistoric raptors

Photo of reconstructed skeleton of Buitreraptor gonzalezorum. Long hindlimbs indicate it was a fast runner. Elongated arms and massive shoulder girdle indicate powerful prey-grasping abilities. | John Weinstein & The Field Museum


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Paleontologists led by dinosaur curator Peter Makovichy of Chicago's Field Museum found the nearly complete skeleton of a 90 million-year-old, surprisingly bird-like dinosaur in the sandstone of Argentina's northern Patagonia, about 700 miles southwest of Buenos Aires. The find suggests that dinosaur flight in evolved twice – once in bird ancestors, and again in prehistoric raptors of South America. The fossil was the size of a very large rooster, with a very long head and tail, and represents the most complete carnivorous small dinosaur found in South America to date. More from

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