Just recently 2 of my 3 BR pullets have started laying on their sides. They will only do this for just a minute and only occasionally. Sometimes one of the other chicks will come and lightly peck at them when they are doing this. I cannot see mites or any redness. They are getting in more and more feathers everyday and are not pecking or pulling at themselves. Outside of this behavior, they are doing GREAT. Is this normal or do I need to treat for anything.