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Re: Diatryma and mammals!

>An important afterthought: eurytropy is common in animals dependent upon
>wetlands.  But they need the deep cover of the marsh, pothole, swamp,
>whatever, to reproduce.  When this cover disappears, so do they.  Indeed,
>predation is a major source of nest destruction in waterbirds of the
>prairies (ref. if needed) which are dependent upon potholes for nesting. 

True, though we have no idea if this applied to Diatryma.

>Also, if something did not prevent radiation of diatryma into more diverse
>niches, a thoroughly reasonable expectation is that we would observe
>adaptive radiation in that body plan!

This could be an artifact of the fossil record, of course.  And some mammal
lines (eg Tubilidantata) aren't wildly diverse either.
Ronald I. Orenstein                           Phone: (905) 820-7886
International Wildlife Coalition              Fax/Modem: (905) 569-0116
1825 Shady Creek Court                 
Mississauga, Ontario, Canada L5L 3W2          mailto:ornstn@inforamp.net