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Dino arms can fold. Oviraptor species at AMNH is folded w/manus at
sixty degrees to radius+ulna. Distortion does not seem to be a big problem
with this specimen. Along with the Sinornithoides fossil it can probably
be said pretty confidently that dinosaur arms can fold justabout as well
as those of a Cornish game hen (Longrich, unpublished observations of
AMNH specimens, last nite's dinner).