Four Horned Sphinx Caterpillar

What is this
I found this at the Road America race track in Elkhart WI. It is about three inches long.
Thank you for your help.
Paul Gehrman

Hi Paul,
This is a Four Horned Sphinx Caterpillar, Ceratomia amyntor. It is also known as the Elm Sphinx since the caterpillar has a preference for elm tree leaves. They also eat birch, basswood and cherry.

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