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Re: Tyrannosaurus was not a fat boy or girl

How is the degree at which pneumaticism reduces the density of the
body assessed in mass estimates? Although you can infer the proportion
of the skeleton which is pneumatic, it looks impossible to tell what
part of the non-skeletal volume is filled with air sacs. However, I
think I once read (probably from Gregory Paul) the claim that body
density is not much lower in birds than in other tetrapods because the
pneumatism is countered by a more solid lung in birds, contrasting
with the larger air cavity of the lung of other vertebrates.