Ultralisks are Zerg heavy ground units that use mono-molecular blades to cut down enemy units.

Known for their durable carapaces, they are more than capable of resisting the first salvo of a standard Siege Tank battalion. Because of this, Ultralisks are often used as meat shields to distract enemies form focussing on the swarming tactics of smaller units such as Zerglings.

For more information see Ultralisk on the parent site.