One of our pullets (about 10 months old dark brahma bantam) seems a little off colour today, she is just not as energetic as usual, and then I found bloody poop in the waterer (Note to self, move waterer!) and then under their roost. They do free range for a few hours every day and I could only find a few bloody looking poops. However they look pretty normal otherwise... could this be her shedding her intestinal lining, what the heck is that anyway and why?