All was well until last Thursday night with my flock, and had been for six long years, disease-wise, which is the last time I had personally had an illness, which was severe sour crop that caused a 6 year old ameraucana to pass. I noticed Vertie, a 3 year old ameraucana, was down on the floor, but I'd seen her trying to lay and sit on eggs in the yard, and she was still laying an egg every day. I thought it was related to her trying to be broody. But the next morning she had visible liquids on the ground around her (wetness-- not sure from what). I let her out-- she went back to her nest, and stayed on it through a thunderstorm. The most marked symptom of anything being off was she seemed out of breath (but not gasping), but it was also 82-85 degrees and humid. However, I knew she wasn't doing great when I picked her up and put her down and she sat down where I placed her. She seemed dazed. That night I decided to check her for sour crop, and squeezed on her crop, and she started puking. She puked up her contents without issues, and it didn't smell sour, and I gave her some oil and apple cider vinegar in a syringe. She had no upper respirtory signs or issues. Her eyes seemed a little constricted, however. None of this went down her trachea, but when I left her for the night I had a feeling she wouldn't be alive in the morning. She had collapsed with her head in front of her, breathing slowly and deeply. She was dead that coming morning. As I mentioned, the only noticeable synptom was her going broody, as she has never done that before and as an ameaucana, it is irregular. I've been keeping everyone up this week due to hawk season and this issue, as I wasn't sure what happened. We also had a cat go missing a few days before that and I've been worried. But tonight I found one of my nonvaccinated chickens (a roo) from this May that hatched here (half houdan, half silkie) belly up on the run floor, gasping for air, with his neck twisting. His comb was a bit cold when I found him. No injuries or broken skin apparent. I brought him in, and with time he straightened out, and is able to stand on his own, but his neck remains underneath him. Temp, pulse, and respiration seem normal. I have video from the hours before, but the IR video, as it was past dusk when I found him, isn't too useful. I can confirm he seemed completely normal not even an hour before. It's possible he could have jammed himself on the kennel fencing or got tangled in the hawk netting, but that would have been off camera. I let him sit in my room for a while, looking like this. He won't open his eyes for me unless I pull them open. There are no liquids from his nare, his eye, or any signs of conjuctivitis. No respitory distress. His droppings are/were normal. He has been wormed. Nothing in his throat I can see. I'm not sure how to go about treating this. I have Tylan but I don't feel comfortable hitting him with that if this is an unrelated injury. What would you do?