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> advance that food will be found in new regimes. And I think flight evolved
> first in insectivorous forms, not carnivorous forms, even in the case of
> avian dinosaurs. I might just buy the evolution of avian flight as enhancing
> the pursuit of flying insects--although many insects are caught while resting
> rather than flying--but what other sources of food could be reached by flying
> that couldn't be reached by other, less energetically costly means?

     How big is the biggest insect hunting bird?  I thought they were all 
really small and manuverable.

LN Jeff