On Mon, 26 Jul 2004 20:52:38 -0400 Kay & Andrew <[log in to unmask]>
writes:
>
> The Euglandina are not doing a very good job. Why do they wipe out
> native
> species in foreign lands, but not foreign species at home?

Andrew,
A predator in an area where it evolved is in balance (generally) with
it's prey species (which are also in balance, and therefore unlikely to
be wiped out by the predator).  Why should it try new foods?  In a new
area it must try new foods as its normal prey is not present.  The new
prey species are not evolved to keep up with this new predator and may go
locally extinct.

Allen Aigen  NYC
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