I have 18 chickens and I've been noticing quite a bit of diarrhea. They all act normal and seem fine but at least half of all their poos are pretty liquidy. I know it's disgusting but I've seen 2 of them poo and it makes a squirting sound. Is this normal? I found a site that showed normal and abnormal poo and all of my chickens' poos look normal compared to that. But is this too much diarrhea?