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I think I sent this posting out poreviously on Saturday when the
list died, so I'll try again.
[Jeff is right; I have what looks to be a previous version of this
message. I forwarded it back to USC for distribution, but USC dumped
it after that. If anyone else sent a message Friday night or Saturday
morning and it didn't go through, write to me and I'll see if I have
it (I could go through and compare my records of "approved"
vs. "received via the list", but it would be tedious and I'd rather
not do it if I don't have to; I'd rather do it one message at a
time.) Jeff, if you want to see your original (in fact I think I
might have a couple of yours), just ask. -- MR ]
I recall that George Olshevsky noted in an earlier posting that the
switch over to a bipedal stance occured not so much for flight or
climbing as to dissasociate the forelimbs from respiration. Exactly how
would this work, and why wouldn't this be equally advantageous for a
ground dwelling animal?
Also, if different theropod groups were really the result of
different radiations of "dino-birds" continuing into the Jurassic and
Cretaceous, for which we have no fossils, wouldn't that mean that
theropod groups would show a lot of features homologous with these
hypothetical groups that do NOT EXIST in any other theropod group? Do
any homologies exist between theropod groups that cannot be explained
unless you consider that theropods are descended from other theropods?
I also want to say I think that easily defensable and logical stories
are very easy to come up with and defend when the evidence is scanty.
For an example: The Hell Creek Formation appears to have been a forested
environment similar to the east coast today. T.rex is likely to have
been an active predator. Therefore, one could speculate that T.rex's
coloring was camoflaged. Does this make sense? Sure. Is it the "best
idea going?" Maybee, who knows? Would I call it a scientific therory?
"Today was great. Chaos is great! Chaos is what killed the dinosaus!"