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Re: Penguin post script

In a message dated 2/24/02 12:03:05 PM, jbois@umd5.umd.edu writes:

<< It assumes that the swimming, foraging, and navigational
abilities of aquatic dinosaurs are inferior to that of sea-going
mammals: seals are able to cross the equatorial barrier, penguins are
not.  This hypothesis assumes that mammals are superior to
dinosaurs.  >>

I think you may be making a leap that Ellis doesn't. He's not saying that 
mammals are innately superior to sea-going birds (or volant birds, for that 
matter), only that the emergence of seals and porpoises may have stressed 
penguin populations, out-competing them in some crucial respects. Also, the 
situation is complicated by the fact that seals prey on penguins. Anyway, I 
don't think you've fairly characterized Ellis' argument.

Caitlin R. Kiernan