You see a spy rat.
Notes
Appears during the supply mission in A Pirate's Tail Quest.
Abilities
Unknown.
Damage Taken From Elements
Physical 
Death 
Holy 
Ice 
Fire
Energy
Earth
Drown
Location
Behaviour
It only attacks Mozzarella Cheese.
Strategy
You can't kill it, use a Rascoohan Rat Revealer to turn it into a Cheese Thief