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Re: four winged Archaeopteryx
Archaeopteryx had a laterally facing glenoid and could easily elevate the
humerus above horizontal, albeit not vertically as per modern birds. A number
other theropods could too, including but not limited to other deinonychosaurs,
as I detail in PDW and DA. I also explain in those two books why
Archaeopteryx probably was a reasonably good powered flier, its arms were more
built and muscled than the legs and were probably the primary locomotary organ.