So this morning, I went outside to play with my chickens. I picked up my chicken 'Zelda' (she's a blue araucana) and ruffled her neck. Only I noticed that she doesn't have any neck feathers. Her neck feathers are all gone. Has another chicken plucked them out or is this a stress thing or disease? I have 3 other chickens, one named Plucky for a reason. Can someone please help me and tell me whats wrong with my chicken! Thanks!