One of my three-week-old broad breasted white turkeys has stopped walking on one of his legs. He holds the leg in the air and hops on the other. It looks as though he can't even stretch out the toes of the foot in order to stand on it. He has been doing this for about a week. He still eats and drinks, but mostly lies in the grass. What could be causing this problem? There is no sign of injury to his leg. I was wondering if anyone else has had this problem. Any help would be appreciated.