One of the big three

While spreading mulch in an area of my yard, I noticed a Giant Swallowtail butterfly flitting from bloom to bloom on Phlox, so I rushed into the house to fetch my camera phone and got four photos before it sailed away.
According to The Butterflies of Iowa (Schlicht, Dennis W.; John C. Downey; Jeffrey C. Nekola), The University of Iowa Press, 2007, on page 308, mid-July through August is the second brood for this butterfly.
"The Giant, the Thoas, and the female Tiger swallowtails are the largest North American butterflies," from National Audubon Society Field Guide to Butterflies, Alfred A. Knopf, Inc., 1981, page 338.

Samsung Galaxy S24 Ultra camera phone, regular photo setting

cropped