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Re: CNN on Lungs and Feathers



At 01:32 AM 1/4/98 -0600, Toby White wrote:
>As I understand it, birds have two methods of pumping the caudal 
>air sacs. ...
>
>You have suggested elsewhere that Theropod caudal airsacs could 
>have been powered by rib compression.  ...
>
I see a possibility for even a different system.  If the postero-ventral
air sacs were relatively small, could they not be inflated by a diaphragm?
(Provided they remained anterior to it, that is).
>
>Pterosaurs managed it without endothermy.

I am not sure we can really say that for certain.


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