Eastern Black Swallowtail Caterpillar

I got all excited, thinking this was a monarch butterfly, but no, it’s a (still gorgeous) impostor — the caterpillar of the eastern black swallowtail butterfly (Papilio polyxenes). The monarch caterpillar has long “antennae” or tendrils on both ends; the swallowtail lacks these appendages. The eastern swallowtail is known by a variety of other names,…