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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[–] 8 points 2 weeks ago (1 child)

No evidence if the intermediate species. It makes sense, but without evidence, it's just conjecture.

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