Re: Palms in

["Scott Hartman" <scott_hartman@hotmail.com>]

> > > It is also suspected now that T. Rex also cared for it`s young in such a 
> > > way. How then did it "bring home the bacon"?....Either many trips, or it 
> > > used it`s mouth,....(perhaps regurgitated food).<<<

Presumably an animal that reduced its forelimbs while evolving a five foot 
long head could manage to bring food to its progeny.  I'm unaware. though, 
of the evidence that suggests any tyrannosaur fed its  young.  I was under 
the impression that the large teeth of juvenile T. rex (=Nannotyrannus) were 
suggestive of having to fend for themselves at a early age.


> > > I still think a better explaination for such  restricted movement in 
> > > theropods in general is a cause of their being secondarily flightless. 
> > > Once specialized for flight, such bone structure would be hard to 
> > > unmodify for other uses.<<<

But basal tetanurans don't have well developed semilunates.  And more basal 
theropods probably could pronate their limbs.  Are you suggesting that birds 
evolved after "ceratosaurs" but prior to tetanurans,  or are you suggesting 
that birds evolved flight without a well developed semilunate, and then they 
and tetanurans evolved them in parallel?

Scott
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