Hi, I have a strange issue going on with my hens. One died out of the blue last week. She was fine one day, then the next was lying around on her side, not eating or drinking, then died a few hours later. Now this morning I found a dead hen in the coop, one staggering, and another dragging one leg behind her. Hens are free-range, going into the coop at night to sleep and in for the morning to lay their eggs. No diet changes, I feed organic/non-GMO feed. We bought some pullets about two months ago, and they all seem healthy with the exception of one that has a leg infection. I've been treating her with amoxicillin. All of our chickens have always been healthy, only loosing a hen or two due to old age. I am terrified that this is some disease that will spread to the entire flock. None of the hens are sneezing, wheezing, or having cold-like symptoms, just the neurologic signs in the two hens as far as staggering, wings off kilter, and looking dizzy. Any help would be greatly appreciated!!