I have 7 red sex link hens, 1 Rhode Island Red hen, what I think might be a black cochin or cochin mutt, and a Rhode Island Red rooster. I began with the Rhode Island Red hen, rooster, and cochin and after several weeks added the red sex links. The first 3 hung together all of the time until the sex links got older and were accepted. Now the black cochin seems to have been cast out from the flock. I free range them as much as possible during the day. She is either the last one out and very slow to leave if she leaves the hen house at all. When she goes out she seems to stay to herself with the others wandering off together. At night she sleeps alone on one roost while all of the others bunch up together on the other roost. I don't know if chickens can feel sad, but it is making me sad to see her snubbed, if that is what it is. Is this normal behavior among chickens? This is my first time to have chickens and I'm loving it other than this situation.