Yesterday I fed my chickens and changed their water at about 5pm;today when i got home from work before 12p. my husband went to feed the chickens and one was dead. I had 6 chickens and their pen is 6x14, the dead chicken was laying in the back corner of their pen. I am not sure what this was caused by. I looked around to see what people would say, but i thought i would get up to date advice. The pen is very secure, my yard is fenced. I do get from time to time a critter in the yard but their is not any way it could have gotten into the pen. I looked at the dead chicken to see if it had any peck marks, or some sign of what the cause of death may have been, but it looked plump and healthy. I am curious to know if i should clean the pen and make sure if this was caused by infection or something that any trace would be gone, or if there are any other safety measures i should take. Thank you for any advice you can give me!