Polyp

This entity resides within Norfair in Metroid and Metroid Zero Mission. It resembles an Air Hole, but tosses small spherical objects in an arc either forward or behind. In Metroid Zero Mission, it resembles one of the several artificial retracting/extending columns constructed of metal, but as if it were restricted from movement by a strange orange, gelatinous substance. The nature of these entities is uncertain, such as if they are in fact organic or artificial in origins. In Metroid Zero Mission, these entities can be frozen by the Ice Beam an destroyed with a Missile, (being destructible without the need of the Ice Beam,) but are completely impervious to weapons fire in the original Metroid title.