Running may have made dinosaurs’ wings flap before they evolved to fly: New evidence suggests that passive wing flapping may have arisen earlier than gliding flight — ScienceDaily

Before they evolved the ability to fly, two-legged dinosaurs may have begun to flap their wings as a passive effect of running along the ground.

Source: Running may have made dinosaurs’ wings flap before they evolved to fly: New evidence suggests that passive wing flapping may have arisen earlier than gliding flight — ScienceDaily

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