I'm new to BYC and I have a question about one of my chickens. I have six red sex-links that are all about fourteen or fifteen months old. Lately, I've only been getting five eggs (which isn't the norm), and one of the hens keeps ruffling her feathers and avoiding the other birds. Today she was standing alone in the run when she suddenly dropped a shell less egg. They always have oyster shell available so it couldn't be calcium deficiency. Thanks in advance for any help/ideas.