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Re: BAD vs. BADD (was: Re: Most popular/common dinosaur misconceptions)
On Wed, 23 Aug 2006 13:32:37 -0700 (PDT) Jura <email@example.com>
> I'd take an all, or nothing approach to the
> hypothetical cutoff too. That is, a dinosaur would
> have to have all the above to be called avian. An
> avian would probably have to lose all of the above to
> be called something else, but that gets a little too
> forward thinking and dangerous.
Character reversals (for instance, secondary flightlessness in some
dinosaurs) are an example of why hypothetical morphologic cutoff points
in classifications can get dangerous.