Swallowtail!

With the purple coneflowers in bloom, the garden is not just a static creation but a marvelously alive place, with birds and butterflies flitting about to sip nectar from the seeds.

Last weekend I captured this swallowtail, which hovered for more than 20 minutes over the flowerbed, landing and feeding and opening and closing its wings.

Where did it come from? How long will it live? I don't know much about butterflies, but seeing this one made me want to learn more.