May 31, 2025 Caterpillar of the Black Swallowtail Butterfly (Papilio polyxenes). A butterfly that can be found in a wide area, southern Canada to northern South America, most commonly east of the Rocky Mountains. These caterpillars enjoy eating plants of the carrot family (Apiaceae). Plants such as parsley, dill, Queen Anne’s Lace, fennel, and carrots, _______________________…