I noticed this chick wasn't standing while eating today. When he got up, he stumbled a lot, then fell over. If one of his legs goes out from under him, he has a lot of trouble getting it back into the proper position. As best as I can tell he's having trouble with both his legs. I check them over on Sundays, do a weigh in, look each one over for problems; he was fine at last check. He also has lost some weight. This group moved outside a week ago. They all seemed to be thriving, but the weather did turn hot a couple days ago. As of this time, none of the other 11 chicks are showing any signs of trouble. Any ideas what might be going on with him? I've separated him from the other chicks for now.