I have four chickens. Been getting 3-4 eggs daily even thru the winter. I get a small white egg, a large white egg, a light brown egg and a dark brown egg. This last week I'm having issues with my hen laying the dark brown egg. Three days in a row I'd find yolk on the three other eggs. Other days that hen just didn't lay. I can't remember when the last time I got an egg from her... it's got to be close to a week if not longer now. First I thought she was cracking her egg and eating it all. But, now I'm worried it's just coming out yolk..... is that even possible?? I see ZERO evidence of a shell. (I get it might have all been eaten by the time I find the smeared yolk.) Help!! I'd love any advice!! The one thing I should point out it all four girls have lost feathers on their bottoms... I don't see any evidence of mites/lice. Appears the feathers are all coming back in nicely now. They all appear healthy other than that. Thank you all!!!