The orange thingy on the head of this black swallowtail caterpillar has a wonderful name: osmeterium. It’s a sense organ that comes out when a caterpillar is threatened. It may also spread smelly pheremones. Okay, so I just like the word osmeterium. We grow bronzen fennel and parsley to feed these creatures. Mostly they show up on the fennel.
These are from Hamilton Traditional School in South Bend, IN.