This morning, my smallest hen was missing all her tail feathers when I let the girls out of the coop. I was concerned, since she's the bottom of the pecking order, and I thought the other two were picking her tail feathers out. I bought some mealworms and anti-pick lotion today on the way home from work. I just inspected all three hens to make sure they don't have mites or lice, and that none of them were injured or have exposed skin. Two of my hens were fine, but the smallest one is shedding like a ripped open down comforter and she's about half the weight of the other two. She has pin feathers coming in under her wings and on her tail, which would seem to indicate that she's molting, but it's the middle of winter and my hens aren't even a year old yet (my best guess is that they were hatched towards the middle/end of February last year). I'm afraid she's sick! Molting right now seems highly abnormal.