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Re: Air sacs in extant non-avian reptiles?



>
>Have you actually compared a pidgen with a gecko? The differences are
>enormous!!!!


Yes, as a matter of fact I have.  Have you actually compared a pigeon with
a crocodile?  Differences aren't quite as enormous anymore.  Or how about
comparing a pigeon successively with a gecko (or better yet a sphenodontid,
since geckoes are very derived), a croc (any croc), something like
Marasuchus, Eoraptor, an allosauroid, Sinosauropteryx, Caudipteryx, and
Archaeopteryx?  Where do you propose drawing the line when you include the
fossils?

chris

----------------------
Christopher A. Brochu
Department of Geology
Field Museum of Natural History
1400 S. Lake Shore Drive
Chicago, IL 60605

voice: 312-665-7633
fax: 312-665-7641
electronic:  cbrochu@fmppr.fmnh.org

http://www.geology.uiowa.edu/faculty/brochu/