Grovebacks are one of the largest indigenous species native to Darwin IV. They spend the greater portion of their lives dormant, buried under the loamy soil and often only appearing as strangely regular hummocks surmounted by small strands of shallow-rooted Darwinian trees. They rise only sparingly to wander ponderously from one breeding ground to the next. Once mobile, they balance upon two thick legs and a single rudder-like limb used to balance them that is dragged along behind them, leaving a deep groove in their wake.