This duckling appears to have a spine problem. I don't know yet if it's male or female, probably be able to voice sex soon. It mostly has its tail tucked under as in the pictures and separated itself from the group often. Nobody picks on it. It rarely says it's tail or lifts it up. I feed Mazuri starter. You can see the coop here. It's mom and dad were brother and sister. Does anybody have advice? If it's female, I think egg laying would be a problem.