I have a white plymouth rock hen named Dorris. She (unlike the other hens) becomes extremely distressed at times. She begins to screech very loudly when she strays too far from the group and realizes the other hens are out of sight, even when all the hens are clucking and cooing. She can’t figure out where the other hens are (even if they are all vocally communicating with each other) unless they are in her direct line of sight. Once she can see them again, she stops screeching. None of my other hens exhibit this behavior at all. All of my hens have been vaccinated for Marek’s Disease. Is she deaf? Should I do something about it?