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Re: Theories on the extinction of dinosaurs

On Mon, 22 Nov 1999 Philidor11@aol.com wrote:

> As long as I'm asking, I wonder why if primitive birds were so close to 
> dinosaurs that the boundary may have been crossed more than once, why 
> flightless birds could not have re-evolved the traits which made carnivorous 
> dinosaurs so effective, and so become the most successful predators after the 
> Cretaceous?  Was the only difference really the proliferation of egg-eating 
> mammals?   

Great question!
And if predatory guilds after the K/T were sufficient, why not _before_?