I spotted this pretty Viceroy butterfly (Limenitis archippus) last Thursday at Occoquan Bay National Wildlife Refuge. The Viceroy has the same coloration as the Monarch, but has a line across its hind wings that is not present on the Monarchs. As I have learned more about insects, I have been amazed to find how often insects have adapted to mimic other species that predators may find bad-tasting or even toxic.
© Michael Q. Powell. All rights reserved.
Mike Powell 
Nice Mike! It is fun to photograph butterflies! Enjoyed seeing your post!