I had a chick (about 4 months old. Hatched by my bantam hen) who all the sudden started acting strange. She was just standing there, all puffed up. She stopped eating and drinking and would just stand, all day, puffed up with her eyes closed. . It was suggested to me that it was probably Coccidia, which made sense. I didn't see any bloody poop, but her other symptoms said Coccidia, so I brought her inside in a small dog kennel and set to work getting some food and water into her, with Corid mixed into it. She seemed to be improving until about an hour ago. I went in to check on her and she was laying in her usual nap corner. Fine. I picked her up and she tilted her head up and started gasping for breath, then turned her head to the side, almost like she had wry neck. I set her on the floor to see what she would do and she stumbled and fell over. I picked her back up and held her. At this point, watching her face, I knew she was about to die. All the sudden she started shaking her head and foaming at the mouth, then she started throwing up mucus. This was not coccidia. I took her outside to cull her and put her out of her misery, but she died before I could. At the very end she was convulsing and throwing up so badly, I wrapped her up in a towel and snuggled her while she died. Maybe some sort of respiratory infection? I have never seen anything like this before.