Not just the United States: cats & other introduced species are a problem all around the world.
In Australia, other disastrous introductions include: camels, goats, pigs, cane toads, foxes & rabbits.
Nor is the problem restricted to animals. Distructive introductions in Australia include: water hyacinth & prickly pear.
Disastrous introductions in New Zealand include: white tail spiders (accidental introduction — bite causes a skin wasting disease), possums & gorse.
What are the introduced problem species in your country?
http://www.ibtimes.com/cats-biggest-threat-us-wildlife-1046306 / feral pest species extinction human artifact wildlife /
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