The term shopping carts refers to a variety of wheeled organisms belonging to the genus cartilaginous which are characterized by the presence of large gridded exoskeleton. The most common of these are cartilaginous grocerius, cartilaginous walmartius, cartilaginous hobousesus, cartilaginous pisspoorus and cartilaginous backleftwheelnoworkii. Though shopping carts are now common in all parts of the industrialized world, wild shopping carts have become nearly extinct, replaced instead by domesticated varieties. Even those carts found roaming free are nearly always domesticated shopping carts gone feral. Sometimes the term is also used to describe a trolley, a similar, related, species.