I have 4 barred plymouth rock chickens. They are almost two months old, and one of them has had diarrhea for the past two days. The color has changed from black to brown to green, but I know it's the same chicken (I've been watching). I figured the green may have been because she was eating grass, but I can't figure out the black and brown. All any of them have been eating is starter feed and grass. I gave them a LITTLE bit of wheat bread a few days ago because I ran out of feed for one morning. I've been waiting to see if the diarrhea would just go away, but nothing seems to be happening. I really don't know how to take care of a sick chicken, and I really need help! Thank you so much!