Pidgit Bill

Pidgit Bills are Pidgits that take the place of Bullet Bills in Super Mario World after Mario or Luigi clears the Special World in the game (or clears all 96 exits in the remake).

Instead of flying on carpets like the Pidgits from Super Mario Bros. 2, Pidgit Bills fly in the same manner that Bullet Bills do. Other than appearance, there is no real difference between Bullet Bills and Pidgit Bills. In fact, Pidget Bills don't appear to even flap their wings in order to fly.

Trivia

 * In the original version of Super Mario World, Pidgit Bills are not seen going diagonal, instead there are regular Bullet Bills. This was fixed in the GBA remake.