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> Given that irregular land surfaces can be found everywhere, if the evolution
> of flight were this easy from cursorial forms, there would certainly be more
> kinds of flying vertebrates than just three (one extinct). Also, what would
> cause the pursuing theropod to abandon a tried and true method of capturing
> prey (by following it the long way across gullies) for gliding? 

      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.     

LN Jeff