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Re: T. rex was a 'slow-turning plodder'...
Michael Habib writes:
> 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.
I remember finding this very hard to believe when I first heard it,
but it does seem to be pretty solidly demonstrated by Prange et
Another amazing fact from that paper (p. 106, citing Brodkorb 1955):
the feathers of a bald eagle weigh nearly two and a half times as much
as its skeleton (677g vs. 272g).
/o ) \/ Mike Taylor <firstname.lastname@example.org> http://www.miketaylor.org.uk
)_v__/\ "Perl is superior to Visual Basic in every way imaginable" --
Brodkorb, Pierce (1955). Number of feathers and weight of various
systems in a Bald Eagle. The Wilson Bulletin 67(2):142
Prange, Henry D., John F. Anderson and Hermann Rahn. 1979. Scaling
of Skeletal Mass to Body Mass in Birds and Mammals.
Am. Nat. 1979. Vol. 113, pp. 103-122.