T. bataar question

[Graydon <graydon@dsl.ca>]

Yesterday, I got down to the ROM to see the Asian Dinosaurs exhibit;
they had two skeletons of T. bataar on display, an adult and a juvenile.

In the juvenile, the cervical ribs formed a smooth size series with the
rest of the ribs; in the adult, there was a very sharp change at the
shoulders, with delicate cervical ribs and honking big thoracic ribs.

So, is this a function of the mounts?  (I was not convinced that the
ribs were all fossile bone; they were not the same colour or surface
texture as the vertebrae)  An allometric change?  Something else?

-- 
graydon@dsl.ca   |  Hige sceal þe heardra, heorte þe cenre,
                 |  mod sceal þe mare þe ure maegen lytlað.
                 |   -- Beorhtwold, "The Battle of Maldon"