supertux/data/images/creatures/owl/owl.sprite

(supertux-sprite
 (action
  (name "left")
  (fps 10.0)
  (hitbox 14 7 35 45)
  (images "left-0.png"
          "left-1.png"
          "left-2.png"
          "left-3.png"
          "left-4.png"
          "left-5.png"))

 (action
  (name "right")
  (fps 10.0)
  (hitbox 14 7 35 45)
  (mirror-action "left"))
)