Save the Ducks! Super Cow!

The little ducks are playing outside and Super Cow is watching over them.
The land is dangerous and full of duck eating piranhas.
Thankfully Supercow can use his fire dance to summon fire that can burn the piranhas.

Instruction:
Touch the screen to start a fire.
Burn the piranhas to get rid of them.
Avoid burning the little ducks.