I've noticed that my nearly four year old Rhode Island Red has been standing in one spot, not moving for most of the day. Yesterday was when I first noticed that her unusual behavior. She had a ton of poop stuck in her feathers, some of it was this weird greenish stuff I've never seen before, I was trimming it out and I realized that she'd kinda been in the same spot all day. I gave her and my other chicken, who is doing fine, some sunflower seeds and yogurt and she hardly ate any! It's not too hot out, the high has been in the 80s and low 90s, so I'm not quite sure what it is that is causing this. She's our first hen so most of the problems we encounter are new and unusual but this one has really gotten to me because she's usually so spirited! If you have any ideas as to what is causing this or any further questions please let me know. I'm going to keep her isolated and see if she drinks or eats and see if there is blood in her poop, but other than that I really don't know what to do or even what's wrong.