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In a message dated 97-01-24 03:27:37 EST, dwn194@soton.ac.uk (Darren Naish)

<< ...it seems instead that the modern
 mammalian megafauna consists of *dwarfed* members (rather than the
 representatives being giants). This is causally related to late Pleistocene
 changing climatic conditions with a decimation of local biotypes... >>

One of those exceptional circumstances to which I referred in previous posts
on this subject. And the Pleistocene-Recent "dwarfing" is not all that
significant, anyway. A few percent. Plus a lot of this so-called "dwarfing"
is an artifact of the differential survival of smaller forms versus the
simple extinction, without descendant species, of larger forms.