Yes, this has been a huge problem worldwide. “Introduced species” have historically become “invasive species”. It is hard to know the real impact that bringing a species to a new place will have, and the result is often that the species takes over by eating the food supply of another species or killing other species. Wikipedia has a list of introduced species: http://en.wikipedia.org/wiki/List_of_introduced_species and this site explains the impact of many introduced species: http://www.actionbioscience.org/biodiversity/simberloff.html.
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