Ann, that's a moth. I've seen similar (or maybe the same) ones in my yard every now and then. Some moths are kind of cool, and some of them fly during the day.
MJ, are those pictures current? Like, you have Swallowtails now? Because if you do I am so jealous! At MOSI this past Sunday there was one solitary Black ST egg someone had found in one of our tanks. I hope it grows up to do well, but at the same time I was like, "What butterfly only lays ONE egg?" Weird.
