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Birds are dinosaurs. Here's how scientists know

13:18
Fossil casting of <em>Archaeopteryx</em>, a therapod dinosaur that lived during the Late Jurassic period (around 150 million years ago). Many fossils of <em>Archaeopteryx</em> include impressions of feathers. (Getty Images)
Fossil casting of Archaeopteryx, a therapod dinosaur that lived during the Late Jurassic period (around 150 million years ago). Many fossils of Archaeopteryx include impressions of feathers. (Getty Images)

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