The JW? Pet Clean Seed Silo Bird Feeder dramatically reduces seed spill outside the cage for your pet bird while providing a clean supply of food. A convenient guard helps prevent seeds and shells from spilling out and helps to reduce spillage when you refill the outer chamber. This gravity feeder helps stop hulls from building up as new seeds fall down and push empty seed husks out of the tray. This easy-to-clean bird feeder This gravity feeder helps stop hulls from building up as new seeds fall down and push empty seed husks out of the tray. No more buildup of empty seed husks on top of uneaten seeds. Stops seed contamination from bird droppings. Can be filled from outside of the cage and will fit securely on all bird cages, including both vertical and horizontal bars with a clever screw-on design. The large size will hold double the amount of seed than the smaller size. An ideal gravity feeder for parakeets, canaries, finches, and similarly sized birds.