I have a very, shall we say active, rooster and over the winter he managed to wear the feathers off the backs of most of the hens. Now they're sunburned. At least, it looks like sunburn; they're red! They have plenty of shade and access to the coop, but of course they don't know anything about sunburn so they wander around and get even redder. Some look like they should be in pain but they all act like they feel fine. Should I put them in a restricted, shade-only area or is there something else I can do to protect them?