Article: Rescued from the invaders' clutches; Over three days, natural resources experts relocated thousands of native mussels threatened by zebra mussels near Cassville, Wis., to sites near the Twin Cities free of the exotic species.(NEWS)

Natural-resources officials from Wisconsin and Minnesota performed a three-day rescue mission this week, but its purpose was not to search for a missing person or clean up an oil spill. They plucked about 2,200 imperiled native mussels from the Mississippi River south of Prairie du Chien, Wis., on Monday and transplanted them to two areas of the Mississippi near the Twin Cities on Tuesday and Wednesday.

The native mussels are under major stress in much of the Mississippi because of zebra mussels, an "exotic" (that is, foreign) species that invaded portions of the river in 1991 and is spreading by the millions literally atop native mussels, suffocating or ...

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