Re: dinosaurs and endothermy

[Jeffrey Martz <martz@holly.ColoState.EDU>]

     I was under the impression that crocodilian cannot expand thier 
thoracic cavity to breathe but instead essentially diplace thier livers 
to increase lung volume for inhalation.  Turtles use basically the 
same method.  This is due to rigidity of thier torso caused by thier 
armour.  Does this mean that dinosaurs could not expanfd thier thoracic 
cavity either, but had to move drop thier livers as well?  There is no 
evidence that the majorty of dinosaurs were very heavily armoured, so I find 
it unlikely that they would have to adopt this peculiar and specialized 
strategy.  If they didn't breathe like birds or crocodilians, how did they 
breathe?

J.MARTZ