A little over a month ago, I forgot to close the door on my chicken coop and sadly a fox killed one of them. The morning after the attack I inspected the 4 remaining, but they didn't seem to have any injury. 48 hours later I found one of them dead for no apparent reason and a week after that, another followed. Now, a little over a month after the first death, one of them is barely moving and barely eats and I don’t know why. Could any body tell me if there is anything I can do?