Zebra Mussels

Since the 1980s, a small and completely inedible species of Russian shellfish has done millions of dollars worth of damage to factories and power plants built near the nation's lakes and rivers. Zebra mussels were brought to the Great Lakes in the ballast tanks of European cargo ships and fishing vessels, and they've been spreading to other American ports and waterways ever since. NPR's John Nielsen reports on a study in the journal "Nature" which suggests that this ecological invasion may only be getting started.

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