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Re: Lungs and Feathers



At 10:54 PM 1/9/98 -0500, GSP1954@aol.com wrote:
>
>Am I suggesting sauropods had a bird-like air-sac complex? You bet, 
>and so have others. Of course the intensely pneumatic vertebrae 
>confirm the presence of air-sacs. The ribcage, .... This very 
>efficient respiratory system probably evolved
>in order to overcome the dead space inherent to their very long 
>trachea. 

Indeed, a paper in _The Complete Dinosaur_ argues, quite convincingly, that
even a bradymetabolic _Apatosaurus_ would have needed an avian style
respiration system for just this reason, along with the large oxygen
requirements engendered by the huge body.

--------------
May the peace of God be with you.         sarima@ix.netcom.com
                                          sfriesen@netlock.com