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Re: Vestigial Arms (was: Theropod limbs - how mobile?)

David Marjanovic wrote:
> Sorry for the misunderstanding, they are correct, but if this is all what
> *T. rex* did with its arms, why would it retain the claws?

What selective pressure would there have been to lose them? 

Perhaps had they had lived for another few million years they may have
atrophied to the point seen in Carnotaurus forelimbs. Or maybe they
wouldn't. "What If" stories are rarely very helpful, except for purposes
of entertainment.

I like the idea that the forelimbs were used during copulation. That's
the only reason why pythons and marine turtles still have grasping


Dann Pigdon                   Australian Dinosaurs:
GIS, Archaeologist          http://www.geocities.com/dannsdinosaurs
Melbourne, Australia        http://www.alphalink.com.au/~dannj/