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Re: FYI -- Microraptor gui, Burnham and Alexander, PNAS...

Sprawling hind limbs may not have worked for early birds, but did work for 
Sharovipteryx and early pterosaurs, sprawlers that they were...

Interesting side note: moving into Anurognathids and Dimorphodon you get a nice 
nearly 90º angle on that femoral head, likely precluding a complete sprawl, but 
producing something akin to an inverted Beechcraft Bonanza V-tail ruddervator. 

David Peters