12 chickens total. No injuries, Buff Orpingtons. I am noticing jet black poop that is tarry looking, (as a nurse this screamsdigested blood) from the amount I am going to say it is only one chicken doing this. Been 9 days since the first time I noticed it. 1. Everybody has full crops at night and empty in the morning. 2. Nobody is lethargic 3. Everybody actively participates in feeding and snacks. 4. No pale combs 5. No blood found on vents 6. Everybody appears bright eyed and busy tailed. I figure if a chicken is passing enough blood to make the stool entirely black there should be symptoms after nine days. Anyone experience anything similar to this before?