Hens less that 1 year old, finding them dead in the coop. One at at time. I am not noticing coughs, watery eyes, sneezing or drainage. the only odd thing I have seen is a milk chocolate colored poop that looks like pudding. Any suggestions? Antibiotics? I don't know where to start. No one "looks" sick, but I have found 3 so far , with the last one just now, dead on the floor.