In the past 2 days, I've noticed that my 6 month old Buff Orpington has been puffing out her feathers a lot. Mostly the ones on the back of her neck, but occasionally she'll puff herself up completely and shake, similar to what I call the "offended shake" that they do after my kids pick them up and ruffle their feathers. She is eating, drinking, laying, and otherwise acting normally. I picked her up and her eyes, nostrils, and feet look normal and I see no sign of injury (I'll check her vent once my son comes home and can help hold her.) Poop also seems normal. I know a "puffed-up" appearance can indicate cocci, but she seems healthy otherwise...could this be the early stages of it? I do have Corid on hand. My only other thought it that we recently lost her flock mate, leaving only 2 chickens (eggs are currently incubating to add pullets) and the other one can be a bit of a bully. She hasn't started laying or squatting yet and acts a bit like a rooster...hoping this will settle once she starts to lay. Could it just be that she's being defensive (it reminds me of a cat or dog when they raise their hackles)? They have a large coop and free range the yard for several hours/day. I feed them fermented Countryside Organics layer feed.