Edited to add: This will be long. I'll break it into three posts. I'm posting in case anyone else has a similar situation and would like to try something instead of culling automatically. I have a 3.5 week old button quail that suddenly started showing odd symptoms with head tilted forward, balance problems, extreme hyperactivity, running into things, etc. 1. Hatched Sept 28 or 29 2. Manna Pro starter, ground finely. Had started increasing size of particles. Quail waterers (fresh 2xs daily) 3. Black reptile heat lights. Overhead florescent lights (daytime) 4. Dry basement, no mold. 5. Completely closed flock. No new birds. No visitors. I had not been anywhere around other poultry or domesticated birds. Had been to one farm store but took my normal biosecurity measures (different shoes, changed clothes, washed hands, etc.) Initial symptom - Thursday Morning 1. Head tucked forward towards abdomen. 2. Hyperactive - RUNNING excessively at high speeds. Ran into the sides of the tub constantly with head. 3. Very active appetite. Paused running only for quick snatches of food and water. 4. Forward head tucked position gave the appearance of nearsightedness or partial blindness, but ability to find small pieces of food contraindicated this. 5. Drinking water occasionally in my presence. 6. Poo - unobserved at this time. Note: Looking back at pictures, I see indications of neck starting to tuck a day or two earlier. I thought I'd just snapped a picture at an odd time. Progression - Thursday 1. Increased forward tipped neck posture. Body balanced more horizontally to compensate. 2. By evening, starting to lose balance and fall over. When balance was lost, would flail to try to regain standing position. 3. After regaining balance would return to hyperactive state. 5. Still running into things, eating, drinking, etc. Cooked and fed several quail eggs for protein and vitamin boost. The three birds ate every speck. It immediately began running hyperactively, eating, and drinking in the new box.