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Re: Did dinosaur wings evolve for breeding display?/Longisquama



However, if the pre-flight stages (by which I mean pre-powered-flight stages) had a significant arboreal contribution ("trees-down"), and the pre-flight wings used for parachuting or gliding, then the wings might have been already quite large long before the advent of flight. It all depends on how much "trees-down" or "ground-up" is in your hypothetical scenario.

Not at all. If wings evolved for brooding and/or display, they may have got large enough for flight before flight itself evolved, and that even under a pure ground-up scenario.