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Re: dinosaur extinction

In a message dated 2/9/01 3:04:20 AM EST, k.clements@auckland.ac.nz writes:

<< What I had not heard before was his claim that this competition was 
size-related. David felt that birds and mammals replaced dinosaurs from the 
bottom up. >>

You can read more about this on pp 85-88 of my Mesozoic Meanderings #2 
(second printing), published in 1992. (Still sold out, alas.)