There is one caterpillar that was thought to be poisonous but it is now been said to just have a pretty bad allergic reaction in a lot of people it is the White Hickory Tussock Moth Caterpillar it is native to Canada and is making its way more into Wisconsin but it is said to cause a burning itchy rash like stinging nettles (itch weed) does other than that I don't think there are any other poisonous caterpillars in Wisconsin but I advise to always identify any insect before handling it in any way
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