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Re: tiny-armed theropods
Forelimb reduction as a mass-reduction strategy may conceivably be
also useful for small theropods if these need velocity. This may not
apply to those which seem to be the faster dinosaurs, ornithomimids
(unless their slender arms actually decreased their weight by becoming
slender), but can apply to likely similarly fast alvarezsaurids.
Although I agree that forelimb mass was relatively small, it is
possible that for the sake of velocity or weight-saving even small
weight saving bears an advantage.