Black Swallowtail Chase

This one Black Swallowtail was zooming around the front of my house yesterday. Boy do they get zippy in August. Touching on so many plants that I would swear it was a female trying to trick a predator into looking at plants away from the eggs. Anyway, it might have been a male chasing a female since I saw two black blurs come around the corner and disappear. I don't think I've ever seen so much patrolling for mates. It's probably because I let the yard go to weeds and now they love it.