Had a couple of these big ol' things in a sapling by the side of my drive at Wilderstead. Nearest I can tell, it's a Cecropia Moth caterpillar. They mostly eat maple leaves, but are found in other trees, as well. This one and its companion were in a box elder sapling. Box elder is in the maple family, for what it's worth.
Cecropia Moth Caterpillar
I don't keep track of bugs much, but I saw a Diana Fritillary in the holler, along with some grasshoppers, a wasp or two, etc. I'll be waiting to see the Cecropias one of these days.