Introduced Feral Populations
Escaped and feral populations of non-indigenous animals have thrived in both the Old and New Worlds, often displacing native species.
Gray squirrels have been particularly successful in colonising Great Britain and populations of raccoons can now be found in some regions of Germany, the Caucasus and Japan. Fur farm escapees such as coypu and American Mink have extensive populations in the Old World.
In the New World, populations of feral European cats, pigs, horses and cattle are common.
Read more about this topic: Columbian Exchange
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