Caterpillar or adult?

it's a caterpillar. After more research I think it's a sphinx. Supposed to eat holly leaves. There is a paper towel on the bottom of this vessel and it crawls under it, then back out. I put in different leaves of oak, sweet gum, holly...to see what it will eat. Internet says HOLLY...

Hmmmm never raised any sphinx moths before one genus I havent gotten around to yet, i would say that or maybe its looking for a place to pupate?

When sphinx moths wander around, like this one was undoubtedly doing when it was found, they're nearly always looking for a place to pupate. Sphinx moth caterpillars go underground to pupate, so if you want to keep it, you could put it in some clean dirt, clean leaves, or even torn up paper in a covered container, so it can hide at the bottom and pupate. If you don't want to keep it, just put it outside in a place where it's not likely to get stepped on while it's wandering. Also, a place where the dirt is soft would be good.

Sherry