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Re: Tyrannosaurus ?

Thomas R. Holtz, Jr. wrote:
>  Some
> possibilities to explain these include:  sexual dimorphism; two or more
> species being present; one species with individual variations; one species
> with changes over time (on the hundreds of thousands of year scale). 

Having just spent four weeks looking at a variety of tyrannosaurs, I
would add one other - different modes of preservation and amounts of
postmortem distortion.