Black Swallowtail caterpillars are very plentiful this year in my garden. I found one in early May that was feeding on the water celery near our goldfish pond. I was shocked to see one feeding so early, typically here in NW Missouri I don't see them until the end of July or sometime in August. This past week I found 5 more feeding on the dill. Friday night I brought one in to try and rear it in captivity. Last night she was already trying to pupate and this morning her cocoon was complete.
This picture shows the alarm response these caterpillars exhibit when disturbed. These odd little orange protuberances pop up out of the head. I'm not sure how this would deter a potential predator, but apparently it works.
This is what she looked like pre-pupation.
This is the sight I woke up to this morning. This is the cocoon fully formed and hanging from the stem of a piece of dill. It should be about 2 weeks and the adult will emerge. I will post pictures. With any luck I will be able to witness the emergence.