I bought 6 "Miniature Bantam Chickens" from Tractor Supply about a week ago. The night after we got them, one of them was found crying and flailing in the water bowl. Since then, we've kept a shallow plate of water and constant food in their steel tub. Today, I discovered 3 of them had a large clump of poop covering their butt. I got it off, but I was wondering what is causing this. I put in a larger water dispenser and removed the food for a while. What should I do?