Re: T. Rex sex(es)

[jshields@iol.ie (James Shields)]

>What is the latest research on T. Rex? Do the robust and gracille versions 
>represent two species or two sexes? Or is it still a giant guess?
>I'd appreciate whatever information anyone can provide.

This could be old news, but I remember reading an interesting piece
comparing the skeletons of T. Rex with those of crocodiles. Apparently there
is a very similar arrangement of arches under the first couple of tail
vertibrae. Seemingly females have larger arches to give more room for egg
laying. This would make the larger specemins the females.

I don't have the reference to hand, but I think it probably came from "The
Complete T. Rex".

James