There look to be five of them (as of yesterday ) — tiny, about a cm each — eating our dill. Check them out:
And compare to the photo and description here.
Do we only have one pot of dill? Maybe we can try to create a black swallowtail butterfly habitat somewhere? Thoughts?
Ansley
UPDATE:
A friend of Dennis’ dad, who follows butterflies closely, saw some differences in coloring in our pic and the web pics and said he’d be interested to see what comes out of chrysalises later in the summer: “I’m inclined to think this is either a newly hatched eastern tiger swallowtail caterpillar, or more likely a giant swallowtail caterpillar,” he writes. I checked out the pics, though, and I’m not sure . . . check them out for yourself and we can see what comes out! Perhaps we can take a poll . . .
Concord Village EarthLab 
Trust a Floridian to properly indentifiy the pretty, friendly fauna.
Photos of the life cycle here: http://www.floridanaturepictures.com/butterflies/black_swallowtail.htm
We have two dill plants that I know of. We could move them over by the butterfly bushes, but (once again) – keep them away from the tomato plants because they attract tomato hormworms.
Good link to common garden pests – photos, facts, and battle tips: http://bnan.wikispaces.com/Common+Pests
– Deb
Neither the Eastern Tiger Swallowtail caterpillar nor the Giant Swallowtail caterpillar feed on dill, or so I’m told. However, the Eastern Black Swallowtail does. My bet’s on you, Ansley, and Black Swallowtail. They’ve changed since Monday; ever interesting.