I have a small flock of coturnix quail, they are about 5 weeks old, 9 in total. Yesterday they seemed well, healthy, no problems. This morning however one is lethargic, when it trys to run it falls on its side and just kicks. If I pick it up it begins to fall asleep. I removed it from the flock put it in a brooder so it is isolated. What can cause this? The weather is outside is in the upper 70's, they have plenty of food and water. There hutch has a run, where they can go down a small ramp and forage in the grass. ( I found this one in the hutch by the food and water) I also don't use any pesticides on my lawn. There seems to be no injuries. All the others seem fine. Any ideas? Any thoughts on how I should proceed or protect the rest of my flock?