The viceroy's wing color ranges from tawny orange (resembling monarchs) in the north to dark mahogany (resembling queens) in the south. It has been argued that selective pressures from predators have given rise to "model switching" in the viceroy, with each subspecies being selected to copy the color pattern of the locally dominant Danaine subspecies. When the monarch's breeding range overlaps with the viceroy, the viceroy will adopt the lighter shades of orange. Towards the south, the viceroy mostly displayed darker orange phenotypes in response to the larger population of queens. It is important to note that the differences between these two morphs is only the color of the wings and the line drawn through the viceroy's lower wings; other features, such as body size and wing-pattern elements, are identical.