The JW Clean Seed Silo Bird Feeder dramatically reduces seed spill outside the cage, while providing a clean supply of food to your bird. 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 and push empty seed husks out of the tray. No more buildup of empty seed husks on top of uneaten seeds.