Does a Parsley Caterpillar Become a Butterfly? Yes! The caterpillar most frequently found on parsley, dill, fennel, and related plants are the larval forms of the black swallowtail (Papilio ...

A medium-sized butterfly in the swallowtail family, this species has two bands of yellow spots and a blue wash on rounded, black wings. It has a red-orange spot with a black centre on its hindwings.