[oc] Butterfly on a Lilac Bush, Northern Illinois - 1920x1080
[oc] Butterfly on a Lilac Bush, Northern Illinois - 1920x1080
[oc] Butterfly on a Lilac Bush, Northern Illinois - 1920x1080
Appears to be an eastern tiger swallowtail, very beautiful!
I think you're right, thanks for the ID! I've seen monarchs and silver spotted skippers around, but I don't think I've seen this type hanging around too much