In 1988, zebra mussels arrived in North America through a ship’s ballast water; within 10 years, they had spread across all five Great Lakes

In the late 1980s, an aquatic invader quietly entered North America through an unlikely route: a ship’s ballast water. That species was the zebra mussel, and within a decade it had spread across all five Great Lakes, triggering one of the most notorious invasive-species stories on the continent.

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