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RE: Tyrannosaur species

        -----Original Message-----
        From:   Thomas R. Holtz, Jr. [SMTP:th81@umail.umd.edu]
        Sent:   Friday, April 09, 1999 4:03 PM
        To:     paleo_mont@excite.com
        Cc:     dinosaur@usc.edu
        Subject:        Re: Tyrannosaur species

        Well, a) the skull has been subject to a bit (!) of deformation
        so we don't know its exact shape; b) all tyrannosaurs go through
some pretty
        dramatic skull shape changes with growth (the "meat" of Carr's
        paper); and c) in fact, where there are differences in skull shape
        "Nano" and other small tyrannosaurid specimens, those differences
        adult _T. rex_ specimens!


        A question for Tom (or whomever): any estimate on the age at death
of the specimen (providing it was a juvenile T. rex)?