Maw luur

Maw luurs were creatures used by the Yuuzhan Vong as waste disposal systems. Maw luurs would absorb the waste the Yuuzhan Vong generated, and convert it to vital materials such as metal, nutrients, and air. Maw luurs were often grown into the exoskeletons of the Worldships to provide the vessel vital nutrients and oxygen to the Yuuzhan Vong on board. It was theorized that maw luurs could provide atmospheres for entire planets.