Yesterday we finished setting up our coop, our oldest chicks are about 4 weeks old, so we are getting close to the time to move them! Today I put them in the coop for a little bit so they could get used to it, and so they could have a break from their brooder. Before I could catch it, i noticed one of my chicks had found a piece of stirafoam and swallowed it whole! The bottom of our coop used to be an old garden, so it is soil. I'm sure there are many more "treasures" in the soil, but I am scared they might hurt the chicks if digested. Is this a huge problem? Or do they digest things fairly well?? They are on grit as well if that helps!