The varying shell colors of quagga mussels in Lake Michigan are shown in this comparison.
The varying shell colors of quagga mussels in Lake Michigan are shown in this comparison. Michael Sears / Milwaukee Journal Sentinel / MCT
The varying shell colors of quagga mussels in Lake Michigan are shown in this comparison. Michael Sears / Milwaukee Journal Sentinel / MCT

Politics & Government

June 24, 2008 6:00 PM

No bigger than a thumbnail, yet this mussel is a huge pain

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