supertux/data/images/creatures/skullyhop/skull_dart.sprite

(supertux-sprite
  (action
    (name "flying-left")
    (hitbox 6 12 22 9)
    (images "skull_dart_left.png")
  )
  (action
    (name "flying-right")
    (hitbox 4 12 22 9)
    (mirror-action "flying-left")
  )
  (action
    (name "flying-down")
    (hitbox 12 4 9 22)
    (images "skull_dart_down.png")
  )
  (action
    (name "flying-up")
    (hitbox 12 6 9 22)
    (flip-action "flying-down")
  )
)