I found this caterpillar eating my parsley, around Austin, TX.
It looks very monarch-ish, but apparently monarchs don't eat parsley. Plus it has knobs on its back.
But it also does not look like the Eastern Swallowtail since there is almost no hint of green in its color.
Hoping that this turns into some type of pretty butterfly I am letting it run amok on the parsley for the moment.