Updated (9/3) to add picture.
*Updated (9/17) to note that butterflies pupate in chrysalids, not cocoons. So Spunky was in a chrysalis!
Please forgive me for shouting. I didn't think it would happen. I was a little afraid the poor caterpillar would die. But no-- such a sweet cocoon. It looks like a green leaf. We missed it at first and wondered if Spunk had climbed out of the jar again. The cocoon looks like this, only bright green. The camera batteries died just as I was trying to take a picture. I will update this blog post when I get one.
I still cannot believe that we were blessed to have a caterpillar that made itself a cocoon!