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Re: Deinonychus antirrhopus scales, feathers, fluff and footprints

I have no answers to most of your questions (and indeed, am curious as
to what those answers might be).
Yes, the new feathered dromaeosaur is enlightening, proving that, yes,
dromaeosaurs did have feathers, but I think specific feather patterns on
the body would be quite variable from species to species, especially
without the selective pressures of flight present.  If you're pressed
for ideas, however, the new dromaeosaur is a pretty good place to start.

Anyway, the arm folding thing is a pretty easy question: arms are held
palms-in, folded as in a bird, but not so tightly.