<Sprite
 filename="data/entities/animals/boss_centipede/bug_blue.png"
 offset_x="13"
 offset_y="13"
 default_animation="fireball" >

 <!-- animation -->
 <RectAnimation
  name="fireball"
  pos_x="0"
  pos_y="0"
  frame_count="4"
  frame_width="26"
  frame_height="26"
  frame_wait="0.09"
  frames_per_row="4"
  loop="1"   >
 </RectAnimation>
</Sprite>