Snow is a 4-week-old white marans, obtained from My Pet Chicken. Other 5 chicks are fine. I monitor temperature, use probiotics and electrolytes - no meds or vaccines - chick grower crumbles - minced fruit or tomatoes or cheese once a day. Chicks were outside yesterday for a couple of hours, with water and feed, enclosed in open mesh. Her symptoms just appeared tonight: single, loud squawk with a moment of backing up and flailing. Brief head shaking with a thread of clear saliva or a saliva bubble. Eyes are clear - no injuries - she is thin, tonight, with an empty crop. Everything was normal until a couple of hours ago. Her "episode" was very brief, and she has been sleeping, since. She has had about 5 episodes, with a couple of them appearing as though she has something in her throat or is trying to catch her breath. Any thoughts are appreciated. I have lost a few hens over the years, but never a chick. 
