Walking through some nearby hills, we came upon this gigantic butterfly. After coming home I got help from Wikipedia and learned that this is a Pale Swallowtail. I have regular Swallowtail butterflies in my yard, but not as big as this.
Though not as common as the Western Tiger Swallowtail, the Pale Swallowtail can be seen in large numbers at puddling parties where up to a dozen or more males may be seen gathered. There they join other species to sip water from damp soil to obtain nutrients for mating … Tiger stripes and borders are thicker than those of Western Tiger Swallowtails. The wingspan is typically 3.5 to 4.5 inches. [Wikipedia]