I need some help, fairly new to chickens, had good luck with healthy birds for the 2 years we have had them. Last summer we ordered a group of polish chicks from a hatchery, my son is raising them for 4-H project. Now the birds are reaching maturity, and looking quite beautiful. This week one of the silver laced was walking in circles when I went in to feed. I picked him up to look at his eyes and he ducked his head between his legs! I put him back down on his feet and still with his head between his legs walked backwards until he bumped into a wall and fell over. He promptly got up and did it again. I have been watching him for 3 days now with no change in behavior, he eats and drinks, but will stand with head between his legs, looking behind him and seems disoriented. They are penned, so no predators, but he could have gotten beat on by the others, I guess. We are a little full of roos right now! His feathers look fine, no obvious missing patches and he is still in decent weight. I was reading about Marek's disease, and hope that is not it since the reat of the flock is exposed, but his eyes look normal and both legs are working, just his balance and posture is weird. Any suggestions? Should I isolate him?