CBS News: All Minnesota worms are invasive, but which ones do you need to worry about? An expert weighs in

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Last week, the National Weather Service issued a "worm warning" in southern Minnesota. 

The warning was in jest – simply a heads up that residents may see more worms than normal due to heavy rain. But it piqued WCCO's interest in the state's wiggliest inhabitants. So we went to an expert to get the dirt on worms.

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