Anise Swallotail

Andy released an Anise Swallowtail at my house today. He also released several Gulf Fritillaries, which would be expected. The Gulf Frits are tropical and fly all year long. But the Swallowtails? They usually overwinter as pupae and emerge in the the spring. So it seems rather odd that this one is out in December. I am guess that it will find no one to mate with and it will never be able to reproduce. So beautiful, a perfect specimen, but a failure of nature none-the-less.