Zebra mussels were brought to the Great Lakes in ship ballast water during the 1980s. They were joined shortly after by Quagga mussels in the early 90s. Today, both are among the most serious aquatic ...

What has black-and-white stripes, likes to settle on rocks, and has two D-shaped shells? That's right: zebra mussels. Otherwise known as the invasive species that's forcing out native mussel species, ...