i went to go close up the chickens for the night and discovered my one hen sprawled on the floor, wing out legs out, all stretched. She looked dead except she was holding her head up and was blinking her eyes. I moved her around a little and her muscles are really stiff, I would've had to force the legs back into place, needless to say she can't walk. She was fine this morning, like perfectly fine, no problems at all. I feed gamebird crumbles, and i did have an issue with some kind of virus like 4 months ago, but after that everythings been fine, and i'v been watching them wikid close. she's been laying everyday, including this morning. I was thinking mareks, but not this quickly attacking? Also her crop is really full, is paralysis symptomatic of sour crop? Whats going on?