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Re: FYI -- Microraptor gui, Burnham and Alexander, PNAS...
Regarding articulation, it is true that the femur would be mostly
disarticulated. Cracraft (1971) however indicated that in retraction,
if the facies articularis antitrochanterica of the femur
disarticulates from the antitrochanter, it can be abducted a maximum
of 35° in pigeons.
Well... I haven't read the paper yet, but in their 2008 SVP talk and in
the NOVA episode, Burnham et al. showed 90°.