I have an 8 wk old Polish, not sure if it's a pullet or a roo (leaning toward roo) who is running in circles and making a screeching/chirping noise. He runs faster and faster in smaller circles, and finally sits down. The others peck at him a little bit. Then, he gets up and paces for a while in the run, then starts going in circles again. Is he sick?? He has no other symptoms, none of them do. I've had a small flock for 2 years, but never any illness or disease, and I don't know what to make of this. Help??