Abstract: An improvement in a cage for small animals or the like having a perforate bottom to allow wastes to be dropped by gravity exteriorly of the cage, a continuous periphery of walls, and a top, characterized by a continuous belt traversing beneath the perforate bottom and contiguous to a scraper and waste collector, and through a cleaning pan adjacent steam-cleaning passageways for cleaning. The belt has motive apparatus comprised of a plurality of gears and belt moving roller connected to an animal-powered wheel to move the belt when the animal runs or walks in the wheel. Also disclosed are specific preferred embodiments including having one of the gears in a gear train movable responsive to movement of a fulcrum lever to disengage the belt from the animal wheel; and having a supplemental belt moving apparatus to move the belt as desired.