You may want to take in a few fresh droppings to your vet for a fecal float. Some worms aren't visible to the eye without a microscope. Those look like they could be roundworms covered in bloody mucus if they don't have segments. Roundworm is the most common chicken worm. Chickens can get several other worms, such as tapeworm, capillary (thread) worms, cecal worms, gapeworm, and eyeworm. Most of them are rare and more serious. Valbazen 1/2 ml orally once by mouth and repeated in 10 days will usually treat most worms. Some use SafeGuard liquid goat wormer 1/4 ml per pound orally for 3-5 days in a row. Here are 2 threads that discuss worming: https://www.backyardchickens.com/t/1090991/worms-and-worming-warning-graphic-pictures-and-videos https://www.backyardchickens.com/t/...g-and-wormer-misinformations-graphic-pictures