So, I'm feeling really crappy. My most Ameraucana looking hen just recently keeled over for no apparent reason. The other birds are looking fine, and she had been too. Until I thought they looked a bit cold and drafty in the winter cold. So I took a big piece of scrap plywood and opened up the side of the coop (its on hinges) to add the wood as a kind of wind break. Chickens were in the coop, freaked out. I leaned it against the side, keep in mind this wood was about as wide as the entire coop, coming at them with unknown intentions. So I closed the side and left them for a few minutes, then I wanted to see if they were using it. So I opened the coop. Miss Hazel was keeled over on her back, wings slightly spread, chest heaving. I panicked, picked her up, she was still breathing, but her head was flopping like a dead thing. I brought her inside where it was warm, but she'd already stopped breathing by that point. Shock or fear death I suppose. Bad genetics, perhaps. I feed fermented (To clarify that it probably wasn't illness or nutrition) and have since closed off the drafty windows and put in a light. There was literally nothing wrong with her, other than, you know, being dead.