Here Is a Spiny Water Flea. Nuke It From Orbit.

The invasive spiny water flea is a voracious predator of native zooplankton in Lake Mendota. Originally from Russian lakes, it made its way to the Great Lakes in the ballast water of cargo ships. Its long tail helps keep it safe from smaller fish.

Credit: Jake Walsh/UW-Madison, because no one else wanted to be near it.

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