Thanks for that, they do roam the garden in the day, but I will get them some different-sized grit. They get pellets, but only about a golf-ball-sized portion each because they get grossly obese otherwise..Maybe they aren't consuming enough grit? You said they are pets, depending on how you have them set up they might not be getting enough. I'd make sure the veg & plant material they're getting is chopped up finely if you are concerned. They could be picky about the full sized grit too, maybe offer them some chick grit? Are they getting pelleted food or crumbles? I could see a Bantam of any breed been a dork and over consuming pelleted feed.