Prehistoric flying or gliding dinosaurs, such as feathered theropods like Microraptor, existed in the past, alongside modern birds which are classified as avian dinosaurs.
Evidence for · 2
Wikipedia: Dinosaur
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Reference article covering this claim directly
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More for · 1
pnas.org: Microraptor reveals specialized gliding capabilities in multiwinged early paravians | PNAS
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Discusses Microraptor, a theropod dinosaur hypothesized to be a glider or flyer.