Ampilus

The Ampilus are desert-dwelling enemies in Skyward Sword. They resemble a cross between a Squilla and an Ammonite. If they spot Link, they will withdraw into their shells and roll at him with their electrically-charged shells. To defeat them, Link must sneak up behind them and then attack their exposed exoskeleton.

After they are defeated, they leave behind their spiral shells which Link can use to solve puzzles.