Let me start by saying that one of my RIR White Leghorn mixes has acted strangely for the last two days. By strange I mean she is at the top of the pecking order and has always regularly reinforced that but now she has been doing a lot of sitting and acting lethargic. I also have a suspicion that she has stopped laying and when I took a closer look tonight I saw and felt that her behind is extremely large. In the pics attached you will se her with another hen who has always been almost identical to her in size shape posture and energy. The hen I am concerned about is the darker one. Does this mean that she possibly has an egg that is backed up? Is she sick? I desperately need thoughts or ideas, please help!