I've seen one of these once before, crawling on the ground. They go on milkweed. They also don't tend to cling to milkweed well and are fast crawlers. We collected a couple to raise into moths. They don't look very pretty as moths, but the babies are interesting. They always remind me of cutoff yarn bits.
I am an Amazon Affiliate, so many of the product links you see on this site lead to Amazon. If you are interested in the product, I would appreciate you clicking through on the links I provide. Thanks!