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
Pokémon Black and White "Yellow", and all subsequent main series games; however, Pikachu will not be obtainable in "Black" and "White" from the start of the game. It was later confirmed that "Black" and "White" are region locked on the Nintendo DSi and 3DS. Game director and composer Junichi Masuda stated that to keep the games fresh, he looks at every previous element to decide what to adapt to the new game, stating "people may not like what they like in the past, trend wise". He explained the new battle styles, stating that while triple battles take more strategy, rotation battles take more luck