Ampilus

Skyward Sword

Ampilus is an unusual desert-dwelling enemy who's only mode of attack seems to be rolling like a Goron. While it looks like a wheel, it appears to be shaped like a spiral or a rolled-up creature, making it strongly resemble the Rollobites from The Minish Cap. Whether it is simply a wheel-shaped enemy or can unroll and move or attack in other ways is unknown. Its body is electrified, and inside of its hard shell is a crab. When Ampilus stops moving, you can walk up to it and slash the head with your sword to kill it.