Re: 4 winged dino NOVA

[David Marjanovic <david.marjanovic@gmx.at>]

> Flight feathers on the forelimbs have the flow of air parallel to the 
> central vein.

The secondaries, yes. The primaries -- no. That's why the primaries are more 
asymmetric.

In *Microraptor* the foot feathers are even more asymmetric than the 
primaries.

> The only other option would be to twist the feet 90 degrees inward at the
> ankles, which I don't think would have been anatomically possible.

Certainly not.