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Re: Air sacs in extant non-avian reptiles?

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

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


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