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Why aren't pterosaurs classed as dinosaurs?

BBC Wildlife

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February 2025

THROUGHOUT THE MANY MILLIONS OF years that the likes of Triceratops, T. rex and Brontosaurus dominated the land, pterosaurs ruled the skies.

Why aren't pterosaurs classed as dinosaurs?

These winged reptiles were the first vertebrates to evolve powered flight and include the biggest flying vertebrates ever to have existed, with wingspans exceeding 10m. Lift was provided not by feathers, but by a membrane of skin stretched between the ankles and elongated fourth fin

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