Red-Spotted Purple (Limenitis arthemis astyanax)
The Red-Spotted Purple (which is mostly blue and has orange spots) is common throughout eastern and central North America. Willow, popular and cottonwood are common larval hosts, but larvae have been found feeding on a wide variety of other plants including cherry, apple, pear, birch, oak, beech and basswood as well as currant and blueberry bushes. Adult Red-Spotted Purples visit flowers, but are most commonly found on sap, rotting fruit, carnivore scat and, especially, mud, which is where I found this butterfly.
The Red-Spotted purple is considered a mimic of the Pipevine Swallowtail, which is reputed to have a bad taste to butterfly predators . It is a subspecies of the White Admiral , a species found mostly in northern North America.