I have had my two female hermann's tortoises now for a few months and I have recently noticed that they are biting each others legs and neck. They seem irritated by it and open thier mouths. I was told they are 3 years old when I bought them. They do not cause any damage to each other when they do it and they seem to do it more when I have cleaned the viv or moved things around in there. Does any one know why they are doing this and if it is preventable. I dont really want to separate them because I dont have the money or the room.