It seems that common wisdom suggests that grit should be supplied free choice but when I put out a small bowl of it (a full measuring cup full), it is gone by the end of the day. I have 6 chickens that are using the grit right now. How long do they hold it in their beak? I don't know if they are just spilling it or what. At the rate it disappears and at $10/small bag, I'm going to go broke just on grit. I'd literally have to buy a bag a week just to keep up with the consumption. I recently started letting them free range and I've heard that they get their grit from the soil (there is plenty of rocky soil around). However, what about at nighttime? Do they maintain the grit from the day? I sometimes put extra oats, millet, flax seeds and such in their coop at night but now I'm worried they're going to choke or whatever happens when they don't have grit. I wish my chickens would just grow some teeth already!