I have a small flock that forages (mostly) in my backyard. (slip through every now and then) They were hatched in May have been laying since late July. 8 hens 3 roosters (I know). Very friendly Barred Rocks, have a nice coop with wood shavings, sleep on roost boards, 5 nest boxes with straw, like to lay in my potting shed though on the extra straw. I noticed yesterday that someone had dark green runny poo. We are doing construction on the back of the barn (where the coop is) and one of the hens got shut in the coop while laying. Not sure how long. When I let her out she was panting. The window had been shut due to cold nights here. It was in the 70s, not extremely hot. This morning, not sure if same hen, was sitting on top of nest boxes head tucked in like sleeping. She is not with rest of flock. One of the others is starting a molt. Any ideas?