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Re: bcf vs. badd

Re: George's recent posting:

> What I'm after is something that would _drive_ 

> proto-birds into the trees, and thence into the air.

What about egg predation?  Animals who could utilize more secure  
nest sites (maybe trees, of course, but what about cliffs and  
such) would be able to produce more descendants. Maybe flight  
evolved not in forests, but along cliff faces.

And thanks, DG, for all the wonderful responses.

Kata McCarville
Colorado School of Mines