Abstract: An animal caging system and an automatic waste disposal system used in conjunction therewith including a continuous belt mounted below a row of animal cages for receiving waste from the cages, a motor for continuously driving the belt about a pair of rollers which maintain the belt taut, and a scraper engaging the outer belt surface adjacent to a chute which guides the waste into a disposable flexible bag held in place by a spring loaded rectangular member disposed about the chute outlet or spout. The belt is mounted in a frame which extends beneath the row of cages on rails of the cage frame which supports the individual cages in one or more rows. The entire waste disposal unit can be removed for sterilization by sliding along the rails. Each cage preferably includes a feeder with a plate deflecting crumbs onto the belt and further plates around the cage bottom for ensuring that all waste is deflected onto the belt.