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In a message dated 95-12-03 14:47:27 EST, martz@holly.ColoState.EDU (Jeffrey
Martz) writes:

>      The right kinds of mutations making that unlikely method 
>possible.  The rarity of flight evolution may be saying more about the 
>rarity of such mutations than the usefullness or redundancy  of flight in a 
>particular way of life.     

The problem is that flight evolution among vertebrates is not _that_ rare.