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Re: T. rex was a 'slow-turning plodder'...
The idea that it was lighter comes from accounting for honeycomb
structures in the bones and air sacs, present in T. rex but not in
elephants. Now, I think 3 tons is pushing it, but I can see a 5-ton
rex. If this case for a lighter rex can be vindicated, I'd like to see
how that would affect speed and turning velocity estimates.
The theropod-style skeletal elements, with their thinner walls and
larger medullary cavities (compared to mammals) probably doesn't do
much to reduce overall mass (the reason being that the overall volume
of bones tends to be greater). In modern avians, for example, the
skeleton accounts for about the same relative proportion of body mass
as it does in mammals. Thus, despite having highly pneumatized
skeletons and thin-walled bones, the lightened bony architecture does
not so much reduce the whole mass of the animal, but rather allows for
the skeleton to be expanded without total mass increasing appreciably.