Okay, so I have a group of 3-4 week old birds, and so far have lost 4 or 5 birds that have done this. I find them throwing their head back and squeak as they open their beak. I've had necropsy's done, and the only conclusion is that they starved to death. No coccidia, or Gape Worms. This bird died about 5 minutes after this video was taken. I assume some type of CRD (Chronic Respiratory Disease), but have treated with Enerofloxin and Tetracycline Powder and it doesn't seem to help at all. I am so lost as to what's going on, and how to fix it. Any advice is appreciated!!