Vanessa cardui painted lady's migration pattern in northern Europe apparently does not follow a strict northwest heading. The range of headings suggests that migrating butterflies may adjust their migration patterns in response to local topographical features and weather, such as strong wind patterns. Laboratory-raised autumn-generation painted lady butterflies were able to distinguish a southern orientation for a return migration path. According to the same laboratory-based study, when butterflies were isolated from the sun, they were unable to orient themselves in a specific direction, opposed to those that did have access to the sun. This suggests that "V. cardui" requires a direct view
American painted lady has none. "V. virginiensis" also uniquely features a white dot within the forewing subapical field, set in pink on the underside and usually also in the dorsal side's orange field. The largest spot in the black forewing tips is white in "V. cardui", pale orange in this species, and orange in the West Coast species. The latter also has a purer orange background color of the dorsal side, as opposed to the darker and (especially in "V. virginiensis") redder hue of the other two. A less reliable indicator is the row of black eyespots on the dorsal submarginal hindwing. In