Rural365 Galvanized Chicken Feeder - Rat Proof Poultry Feeder with Lid Weatherproof Outdoor Coop Food Dispenser, 50lbs

What makes this feeder “rat-proof,” as stated in the title description?

I need the cover I am getting rats!! I would rather not have to take it in at night and we are experiencing rats! They are feeding at night

Description mentions that it works with all feeds, but I’m having a hard time with the feeding bin filling with pellets. Is it pellet-compatible?

Is anybody having trouble getting the feed to go down into the feeder?