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Did "Dave" have 4 wings?

GSP's article in PT#60 and discussions on message boards made me examine
more carefully the photos of _Sinornithosaurus_ sp. aka "Dave".
Is that evidence of a hinwing that I see below a foot on the counterslab? So
was "Dave" 4-winged?


Many thanks in advance for any thoughts.

Cheers - Aspidel.