Hi there, I've done a ton of searching online and on the forums. I spoke to one of the state poultry inspectors, but I figured I would ask here too. Here's what is going on: I have three birds. One is an older (about 3 years) Red Star that finished going through a molt towards the end of Thanksgiving. The other two are Easter Eggers and this is their first winter. One Easter Egger is still laying, the other two birds are not laying currently. I am supplementing their coop with light from 4AM-10AM each day. The Red Star and one of the Easter Eggers have had bloody droppings off and on for the last 6 or so weeks. I keep things clean, the chickens have adequate coop and run space, and have occasional free-range time in my side yard. Roughly once a month I add apple cider vinegar to their water for a few days followed up by probiotic. I have been adding probiotics to their waterer regularly over the last couple of months. I've brought two fecal samples (a couple of weeks apart) into my local vet that have been tested for parasites (I confirmed that they are testing for cocci among all the other common worms/etc.), both tests have come back negative. I have seen intestinal lining passed in droppings before, it's most definitely blood, and not lining. Other than the lack of egg laying and bloody droppings, the only other noticeable symptom is pale combs (not super pale, but not bright red as they often are). All three birds are active and eating/drinking well. If it's not a parasite, my thoughts would be that it may be something bacterial. I'm not a huge fan of giving antibiotics to the chickens without knowing specifically what's wrong (I don't want to kill off beneficial bacteria in their systems), but I am concerned that I may lose the birds if I do not take additional action. Thank you for any thoughts you may have about the best way to proceed! tl;dr bloody droppings, negative fecal float. Since it's not cocci, what could be wrong?