I have an 11 week old chick who is having trouble walking and has very swollen legs. When he tries to walk it looks like he is walking on his heels and looks unsteady but he stands very straight up. 90% of the time he is laying down with his legs completely straight so his head is almost resting on his feet. I have checked the bottom of both feet and i can't see any signs of bumblefoot. Does anyone have any idea as to what it might be? Below is his foot next to a normal foot for comparison.