We don't know how pterosaurs evolved powered flight. The most primitive, probable, ancestor of pterosaurs had a bodyplan closer to that of a kangaroo. And the earliest pterosaurs like Preondactylus or Eudimorphodon were already fully capable of flight.

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[–] 5 points 1 week ago

And with gaps in fossil record that last for millions of years, who knows whether we will ever figure out the pathway to flight.

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