Ear tag ear is tagged. Australian sheep and goats are required to have visually readable ear tags printed with a Property Identification Code (PIC). They are complemented by movement documents supplied by consignors that are used for identification and tracking. Very small ear tags are available for laboratory animals such as mice and rats. They are usually sold with a device that pierces the animal's ear and installs the tag at the same time. Lab animals can also be identified by other methods such as ear punching or marking (also used for livestock; see below), implanted RFID tags (mice are too small
Quarter marks to help the pattern stay in place. Commonly, quarter marks are made in a checkerboard pattern, but many variations exist. In addition to highlighting the shine and health of the horse's coat, some designs are intended to help define the musculature of the horse or simply as an identifying or fun mark. Use of modern stencils allows for creation of fanciful shapes such as stars or hearts. Quarter marks tend to go in and out of style in the horse show ring and are seen more in certain regions than others. Quarter marks are frequently seen on police horses when