I wanted to know if there is a disease going around my flock or if this is normal and nothing to worry about I was out in the yard today and noticed a black pile of poop in the grass,i then went to enter the coop and saw it all over the floor of the coop, some of them are laying normally but i cannot determine who is laying the black stools. this is the first time ive noticed it and i am paying attention now to all of my chickens and trying to figure out who is laying so i can determine if they show any other signs of a problem but so far no luck. Has anyone else had a problem with black,completely black watery type stools? what is the cause of it? what can i do to fix the problem? is my flock in danger,is it contagious?