My Own Black Swallowtail Caterpillars!

Last Spring I planted parsley in my "sunny" flower garden in hopes that I'd be able to entice Black Swallowtails to visit. I've noticed others lately who have spotted the caterpillars. Frankly, I don't mind telling you... I was a bit envious. However, this morning (as I began the process of gathering and disposing of fallen leaves before they get too deep) I checked my plants.

Something suspicious here?

Do, do you see what I see?

Ohmygoodness! On my very own parsley plants...
a Black Swallowtail Caterpillar.
(click the name for information)
Beautiful!

Actually, I found three large caterpillars,
and there were several that looked as though they hadn't hatched long ago.
According to the article, newly hatched larvae have a white band...
it's discernible below, I think.
(Compare this little fellow to the parsley leaf.)

I understand they overwinter within their chrysalis.
I assume I'll have to somehow protect this plant.

:-)