What causes chicken poop to turn teal green? One hen had it for two days and then it changed to bloody diarhea. Now the others are getting it. I have them on tetracycline hydrochloride. I think it is helping, but I am not sure what caused it and how to prevent it from occuring again. Believe me there is nothing scarier than seeing your hens bleeding from the hiney! In retrospect, I also noticed that the shells were getting lighter in color and now they are not laying at all. ANY hints and advice are greatly appreciated! Thank you even!