Super Mario World
Pidgit Bills first appear in Super Mario World after the player finishes Special World. They are shot out of cannons and can harm Mario or Luigi if he touches it. Pidgit Pills can't be eaten by Yoshi, defeated by a cape twirl from Cape Mario or by fireballs from Fire Mario, but however, they can be defeated by contact from Mario if he is invincible, or by simply jumping on them. These characteristics resemble a Bullet Bill.