This is, specifically, the Canadian tiger swallowtail butterfly. I think I have never seen the so-called Eastern tiger swallowtail, certainly not this far North. But this one is a regular visitor around our house. There is another swallowtail here but it is less frequently seen, and it is more largely black than this one. Thus, locally, many people — like me for one — call this one the Yellow swallowtail in contrast to the other, the Black swallowtail.