Guineas waste a LOT of feed. They toss it around like they pay their own bills, and it gets trampled into the mud to mold. Gross. My muppets had a successful hatch last year (only because I interfered on every level; parenting isn't really their bag), and with everything the way it is, wasting even more extravagantly expensive feed wasn't something I was looking forward to. While looking into low-waste PVC chicken feeders I found this one. I love it. It holds more than a 50lb bag (mine get a mix, so this is handy), the food stays clean, and waste is almost nothing. Of course, they're guineas, new = bad, so they had to be suspicious of it for a few days but they knew their food was in there and figured it out. I'm expanding the flock this spring with a second coop and will purchase another.