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Air sacs in extant non-avian reptiles?

 Dear all

I have read that ait sacs extending from the lungs are present in some extant, 
non-avian reptiles. I'd be interested to know the names of these reptiles. 
Also, if someone has tried to explain the function of these structures in these 
dead-end lungs, please tell me.

Best wishes,

Henri Rönkkö
Soittoäänet ja ikonit matkapuhelimeen!  http://www.iobox.fi/