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Re: CNN on Lungs and Feathers

>This is not actually an issue in regard to its *existence*.  The reason
>that pneumatic vertebrae demonstrate the existence of an adjacent air-sac
>is that such pneumatic cavities are only known to form by expansion of
>diverticulae from such an air-sac.

So by this reasoning turtles, crocs, and lizards--animals with pneumatized
vertebrae--also had air sacs?

>May the peace of God be with you.         sarima@ix.netcom.com
>                                          sfriesen@netlock.com
    Terry D. Jones                             Voice:  541/737-6120     
    Oregon State University              Fax:      541/737-0501          
    Dept. of Zoology                         JONEST@bcc.orst.edu
    3029 Cordley Hall
    Corvallis, OR  97331-2914