I had a BST pupate yesterday. I was just looking inside the cage at the different chrysalises and saw this one twicth! I had chalked it up to my imagination when it happened again. I know that monarchs continue to twitch violently for awhile, but this is a BST and it pupated yesterday. Should I be looking for a string with a horrible tachinid fly or something? Yuck! CalSherry, this is the caterpillar that I told you was making strange contortions when we were talking on the phone. We then determined it was probably making the sling.