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In a message dated 95-12-01 02:23:47 EST, ornstn@inforamp.net (Ronald
Orenstein) writes:

>Besides - it's enough to postulate the existence of a whole range of
>arboreal protobirds no one has discovered or identified.  Do we now have to
>postulate another range of arboreal predators pursuing the first lot, also
>neither discovered nor identified?

Evolution thrives on diversity. We have seven or eight specimens of
_Archaeopteryx_ as the _entire_ fossil record of volant aviforms for the
_entire_ Jurassic period. I suspect we're missing a few!