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Re: Air sacs in extant non-avian reptiles?

In addition to 'most' paleontologists, 'most' ornthologists agree that
there is a very strong arguement for the origin for birds having arisen
from dinosaurs.  

You might try checking such basic ornithology textbooks (I recomend THE
MANUAL OF ORNITHOLOGY Yale university press).  The textbook is
beautifully illustrated and is very clear on why there are different
possible avian origins.

The _Manual_ sites 3 possible orgin theories for birds- one that birds
arose from dinosaurs, one that birds arose from some
as-yet-unidentified-archosaur, and one that mentions Chatterjee's
Protoavis as a possible avian origin.

Perhaps you should research more into the area of just WHO says WHAT
about avian origins before slamming the professionals on the list for
speaking with a closed mind.

-Betty Cunningham

ELurio@aol.com wrote:
> In a message dated 7/31/00 10:25:09 AM, tholtz@geol.umd.edu writes:
> << Did you not happen to catch the line in the posting you quote which read:
> "a shift in the convention of naming groups, with a traditional system based
> on grades of organization and the current system based on nested pattern of
> ancestry."
> When you come to understand the change in this shift, you'll figure this
> out. >>
> Of course I do, a group of palentoligists who wished very much that dinosaurs
> were still alive decided that the best way to do so was to downgrade birds
> from something unique and beautiful into tiny T-rexes. Since dinos are
> repties, then birds, which are an unimportant group of dinosaurs who just
> managed to survive to the present day, must be too. While most biologists
> don't accept that, a few palentologists do, and most of them post here.
> eric l.

Flying Goat Graphics
(Society of Vertebrate Paleontology member)