Beautiful, almost translucent, caterpillar was crawling on a piece of driftwood on my patio. (Lead Hill AR USA)
With your great photo of the caterpillar showing the head and rear, it is a Luna moth caterpillar. The Luna and Polyphemus caterpillars can look similar at this late stage of development, but seeing the rear markings helps with the ID.
This caterpillar is the orangish brown color because it is about to pupate. It is heading to make a cocoon in leaf litter.
The beautiful moths do not eat. The caterpillars eat foliage of a wide variety of trees including birch, persimmon, sweet gum, hickory, walnut, and pecans. The caterpillars eat enough to keep the moth flying for its short life to reproduce.
This insect is found over eastern North America from Nova Scotia west Saskatchewan and to eastern N Dakota south to eastern TX then east.