A litter box has two unit assemblies and a waste receptacle. The first unit assembly has an unenclosed litter compartment; a compartment to temporarily hold filtered litter; and a pivotally mounted screen that filters out waste material from the litter. The second unit assembly is a support base having a motor mounted thereto that manipulates the first unit assembly, and contains a motion sensor and controller. The first unit assembly is partially rotated by the motor which causes litter and waste to move away from the litter compartment towards the temporary compartment. The screen filters litter and waste only allowing filtered litter to enter the temporary receptacle, forcing waste solids to pass by the temporary compartment into the waste receptacle. The motor reverses, and the filtered litter in the temporary receptacle is communicated back into the litter compartment by passing through and under or back through the screen.