How do you take care of a Black Swallowtail Caterpillar?

when I had one i kept its cage clean and it eats most plants [non poisonous] and they love carrots. I gave mine carrot shreds and they love it. after this for a while they pupate. [go into a cocoon] and eventually they hatch as adult black swallowtails. Remember to let them stretch their wings before they can fly. Sorry if too much info...