Question Mark Caterpillar
Here is a caterpillar I saw while backpacking in South Carolina. I think it is a question mark (?). Didn’t see any on your site, does this seem like the right ID?
This is probably a Question Mark Caterpillar, Polygonia interrogationis, but it could be a closely related species like the Comma. At any rate, the posture indicates it is getting ready to form a chrysalis. For the record, there are other Question Mark caterpillars on our five caterpillar pages.