I have (had) 3 buff orpingtons and 1 americuana all about 1 yr 3 months. Let them out of their run to roam in the back yard. I came out to one of my orpingtons laying flat on her back! she was still warm on her back and there were no wounds or blood anywhere. There was a small puddle of water or saliva coming out of her mouth.. any ideas? They are all laying, mostly one a day or every other day.