We have a small backyard flock. In the last 2 months we've lost 3 chickens. All about 3 weeks apart. The only symptom has been a heavy gait with a waddle to it. We have a flock of 10week olds that we need to integrate but we have another dead hen this morning. I know we should clean everything out and wait for a few weeks now, but any guesses as to what's wrong? We just use standard feeders and waterers. We're in the process of switching over to systems that keep the food and water fresher. My only guess it's that they slept in the nesting boxes until recently when we finally broke them of it. I was always cleaning poop of their fluffy bums and poop out of the boxes. If it's from that, would it be contagious?