I did some research and it closely comes to this thread I found: https://www.backyardchickens.com/t/186576/yellow-poop-lethargic Earlier today I went outside to let my chickens out of their coop and all but one came down the ramp, I became worried and went inside the coop to see that my Plymouth Rock was still sitting on the roost. She looks very sleepy, showed no interest at all in eating their regular food, and she passes small amount of poops that are yellow. I even brought her some mealworms (her favorite), she usually just gobbles them up, but not this time, she slowly picked and ate some. She also drank some water when I put her down from the roost. I went back into the coop to give her some yogurt mixed with her food and she was back on the roost, she did eat some though. When I move her/pick her up she seems very weak, she looked just fine yesterday too... She's currently on Purina Start & Grow medicated feed and is only around 15-17 weeks old, not even laying yet. The water inside their coop is just plain water, while their outside water has some apple cider vinegar in it. Here are some of her droppings: Here's a picture of her My other 3 chickens, that look normal, are currently roaming around in my backyard, as usual, but then I found this by one or some of them: Is there something going on in my flock? I'm going to see if I can get my BR to eat some more yogurt, this time with some hard-boiled egg. If this information is any useful; she once had a abscess on her face when she was younger, which was later treated by a vet and some medication. She's such a sweet chicken too, it makes me cry to see her like this.