Species that are considered high risk have a well-documented history of invasiveness in at least one location globally, and a high or medium climate match to the contiguous United States.
The faucet snail, Bithynia tentaculata, has a broad native distribution across Europe. It has been introduced to the U.S. and is currently established at locations in the Great Lakes, Northeast, and West. It is a likely competitor with native mollusks and is known to foul water systems where introduced. B. tentaculata is a host for parasites that have been responsible for tens of thousands of waterfowl deaths in the Upper Mississippi River. Climate match is high for B. tentaculata in the contiguous U.S. Overall risk for this species is high.
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High Risk
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