I have two New Hampshire Red hens that I had for a few years in which one of the hens seems to be aggressive towards me. Her aggression seems to always be directed at my shoes as if she views them as if they were a separate creature. She normally is calm and very docile and it doesn't even matter what type of shoes I wear. She seems to attack me when I walk away from where she is even if I am not near her and she will charge at me and begin nipping at my heels. When I turn around she has her hackles raised and one wing lowered to the ground. Sometimes when I go to the coop in the morning I have noticed that when I am in her sight she will lower one wing and peck aggressively at the floor. I would like to know the reason behind the cause of this behavior and what I can do.