I just got a few chickens and they get to run around the yard. Well, their new favorite place to hide is under a lemon tree which has potatoes growing under it. I see them pecking at the greenery of the potatoes all the time now. They are now starting to get runny noses and loose stool. One also seems to want to sleep all day. Another has oily feathers. I didn't know if it was the potatoes or if they just have a resp infection.