Hello everyone! I need help. So in the chicken run I have two small bowls of oyster shell and grit hanging on the fence for them to eat free choice, but because it has been snowing they haven't been coming outside as much. The real issue is that the snow is getting in the bowls, and then it freezes and prevents the chickens from taking any. Lately I have been just putting a bit of each into their feed, but obviously this isn't the right technique. Inside the coop the floor is all pine shavings and they have several roosts all around the room, so if I just set some bowls out there is no chance that the shavings and stray poops will just stay out of the bowls. How should I go about making sure they have what they need? Thanks in advance.