> Seems like it turned out to be optimal to stick to two, not just for terrestrial mobility, but due to the (bidirectional!) optimization of the wishbone and the chest musculature.
If they fly through the same air as airplanes, you also lose efficiency wherever you have wingtips (pressure below leaks above, basically), and the rear wings can get messed up by turbulence/vortices from the front wings if you're not careful.
If they fly through the same air as airplanes, you also lose efficiency wherever you have wingtips (pressure below leaks above, basically), and the rear wings can get messed up by turbulence/vortices from the front wings if you're not careful.