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RE: bauplan convergence

From: Betty Cunningham wrote
> I still put a vote behind the protofeather sexual display hopping thing
> for wing development; which is niether trees up or trees down, really. 
> It makes more evolutionary sense to have a pre-flight-capable wing for
> making pretty, that later develops flight-worthiness, than a post-flight
> flipper developing flight-worthiness does...

Threat or defensive displays would also fit that scenario.