Sheegoths are a feared species found in the Metroid series, including and currently limited to Metroid Prime for the GameCube. They are menacing in appearance and are extremely powerful and hard to kill. The only way to defeat a Sheegoth is to blow up a Sheegoth's shell.
In the game, many baby Sheegoths can be found, though only one adult form, which acts as a mid-boss of the level. They have the ability to shoot out an icy breath which will quickly freeze whoever it's intended to hit if it hits its target.