Can someone please help me figure out what's wrong with my Icelandic chicks? They are around 5 months old now, when I let them out in the mornings some of them can't stand up, they just kind of lay on there side with their feet out from under them. I don't think it's Mareks (spelling?) disease since after I help them up they can walk on their own without much trouble. It's like temporary paralysis of their legs. What could be causing this? Any advice or answers are very much apreciated.