RE: T. rex was a 'slow-turning plodder'...

["Richard W. Travsky" <rtravsky@uwyo.edu>]

On Sat, 9 Jun 2007, Brandon Pilcher wrote:
> Why does Hutchinson think a 3-4 ton rex is implausible? The article did not 
> do a very good job at explaining the problem with that idea (science 
> reporting for the lay masses at its finest again). As I understand, the 
> standard 7-8 ton estimate for Rex used in both Hutchinson's studies and most 
> dinosaur books is based on measurements using elephants. 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.

Are there known rex tracks? To perhaps derive a weight estimate?