Tag apparatus for attachment to the ear of an animal including a male member with a stem and a penetrating head for penetrating the ear a portion that abuts against the hack of the ear and cannot be pulled out of the ear, said portion having an end that is not directed towards the head of the animal when the apparatus is fitted to the ear such that when the apparatus is fitted to the ear, the apparatus has no overhanging material on which the animal can entangle the tag apparatus on a structure.
