The PVC feeder in my Orp coop has a huge opening because of my rooster's big head, LOL, so yes, they do dump feed from that particular one, but with limited floor space, it is the best one for the job. If you could make multiple oval or roundish openings, they could not bill it out like they tend to do sometimes. I would make one like it again and make smaller individual openings and it would be improved. I never have had any issues with mice in my coops.
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Yeah, my rooster has a big head too with his big 'ol comb I don't think his head would fit in any of the feeders with the holes unless they were pretty big holes or ovals....LOL