I have a silkie rooster, not sure of age, (we got him last year at auction) who 2 days ago started acting a little off. Today he has very poor balance, squats almost like trying to poop then falls back on his haunches. When he pecks around at the ground he lays down to do so. When he walks he takes very short unbalanced steps. His crop is full he is still eating and drinking though not with much energy. Does not seem to have any respiratory symptoms or obvious injuries. IDEAS? HELP? RECOMENDED TREATMENTS? Do chickens get constipated?