The Viceroy is a Monarch look alike that uses the monarch colors to give it a survival edge. Predators avoid Monarchs because they contain toxins that the Viceroy does not contain. But since they resemble each other so much, predators that avoid Monarchs avoid Viceroys also. It is hard to tell the difference but the Viceroy has an extra black line that runs across the top of the hind wing.
Date 7 October 2008, 12:46
Source 2748 Very Viceroy
Author John Flannery https://www.flickr.com/people/24135011@N08 from Richmond County, North Carolina, USA
Source: https://commons.wikimedia.org/wiki/File:2748_Very_Viceroy_(3081894385).jpg

The viceroy butterfly (Limenitis archippus) is a North American butterfly that ranges through most of the contiguous United States as well as parts of Canada and Mexico. Its wings feature an orange and black pattern, and over most of its range it is a Müllerian mimic with the monarch butterfly (Danaus plexippus).
Order: Lepidoptera
Family: Nymphalidae
Genus: Limenitis
Species: Limenitis archippus (Cramer, 1776)