
Not knowing what it was, I googled "giant horned caterpillar", and immediately found the name.

I'm borrowing this quote from an Ohio State University fact sheet:
"They are enormous in size, being five to six inches long and nearly 3/4-inch in diameter. They feed for a period of 37 to 42 days on the leaves of hickory, walnut, butternut, pecan, ash, lilac, persimmon, sycamore, sumac and sweet gum. Larvae mature in late summer, wandering around searching for a place to burrow underground to pupate. Overwintering occurs in the pupal stage.
The moth (Royal Walnut Moth) has a wingspan of five to six inches and is seen in midsummer. It has a long body covered with orange yellow hair. The forewings are gray with orange veins and yellow spots. The hindwings are primarily orange with scattered yellow patches."
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