I have a hen I got about a month ago with a few others who has had watery poo for the last 2 weeks. She's looking healthy, eating, laying eggs and behaving very chickenly and none of the other hens have gotten watery poo so I'm not sure if there's anything to be done about this? What comes out is a stream of fluid and a small pile of normal poo. I've already seen the chart of poo pictures and none are very helpful in this case. I've kept chickens for a few years and have not encountered this before. Thanks in advance for any advice you can give.