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Re: Tyrannosaur age-population distributions


I haven't seen the paper yet so I have a question for those with wisdom:

I find it interesting to consider the possibility that the large change in
size as the individual grew essentially required it to occupy different
niches. How long is development along the lines of juvenile skeletons (large leg to hip ratio etc.) and how abrupt is the transition to adult hood?
Is there any evidence of the kinds of differing selective pressures in young individuals?

-Jonas Weselake-George

----- Original Message ----- From: "Andrew A. Farke" <andyfarke@hotmail.com>
To: <tholtz@umd.edu>; "'DML'" <dinosaur@usc.edu>
Sent: Friday, July 14, 2006 8:51 AM
Subject: RE: Tyrannosaur age-population distributions

-----Original Message-----
From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu] On Behalf Of
Thomas R. Holtz, Jr.
Sent: Friday, July 14, 2006 8:34 AM
To: bigelowp@juno.com; dinosaur@usc.edu
Subject: RE: Tyrannosaur age-population distributions

> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu]On Behalf > Of > Phillip Bigelow > > It's hard to wrap my mind around why we don't have *any* (to my > knowledge) isolated > Tyrannosaurus/Daspletosaurus/Gorgosaurus/Albertosaurus bones from animals > of, say, 1.0 meter size, already in museum collections.

Well, don't get too obsessed with tyrannosaurids.

(Did **I** just type that!?!? :-S)

It isn't like collections are dripping with juvenile Triceratops or
Edmontosaurus or Ornithomimus or (shifting provenance)
Diplodocus or Apatosaurus or Camarasaurus or pretty much ANY dinosaur.

To be fair (coming from someone obsessed with tyrannosaurid food), I have
run across at least one juvenile Triceratops horncore in about every major
museum collection I've looked at. London has one or two (picked up by the
Sternbergs), Hatcher picked up a few (now at the Smithsonian), etc. They
were just never published. On the other hand, I never have seen any tiny
femora, etc. . .maybe the horns were just the least appetizing bit of the

Then again, maybe this juvenile material comes in fits and spurts. There
been no problem finding juvenile Triceratops skulls in recent years (or
finding T. rex skeletons, for that matter!).