Great big swallowtail caterpillar munching on some dill at blackshear community garden.
This guy is pretty ragged (and still plugging on), so I'm not absolutely certain if I have identified correctly.
4th and 3rd instars
The (eastern) black swallowtail (Papilio polyxenes), also called the American swallowtail or parsnip swallowtail, is a butterfly found throughout much of North America. It is the state butterfly of Oklahoma. An extremely similar-appearing species, Papilio joanae, occurs in the Ozark Mountains region, but it appears to be closely related to Papilio machaon, rather than P. polyxenes. The species is named after a figure in Greek mythology, Polyxena (pron.: /pəˈlɪksɨnə/; Greek: Πολυξένη) who was the youngest daughter...