The viceroy (Limenitis archippus) is a North American butterfly that ranges through most of the contiguous United States as well as parts of Canada and Mexico. The westernmost portion of its range extends from the Northwest Territories along the eastern edges of the Cascade Range and Sierra Nevada mountains, southwards into central Mexico. Its easternmost range extends along the Atlantic and Gulf coasts of North America from Nova Scotia into Texas.
The Viceroy is well-known for its mimetic resemblance to the Monarch (Danaus plexippus). The black median line across the hindwing is the quickest way to distinguish it from the Monarch. These two species can even be separated on the wing by their distinctive flight: Monarchs have a leisurely, floating flight and hold their wings at an angle above the body when gliding, while Viceroys hold their wings in a flat plane when gliding, a behaviour characteristic of the genus Limenitis.