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Re: [dinosaur] Dinosauria reclassification joins Ornithischia and Theropoda in Ornithoscelida



Ruben Safir <ruben@mrbrklyn.com> wrote:

> in essence there is a cost to the forelimbs not being modified


If by "modified" you mean shortened - then it's been argued that there
is a cost to bipeds (especially cursorial bipeds) in retaining long
forelimbs (e.g., Carrier et al., 2001; Persons & Currie, 2017).  This
cost can be mitigated by evolving ways to fold/flex the forelimbs
close(r) to the body.