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
Viking art category of Viking period artefact, their design and decoration largely independent of the developing styles characteristic of wider Viking artistic endeavour. A non-visual source of information for Viking art lies in skaldic verse, the complex form of oral poetry composed during the Viking Age and passed on until written down centuries later. Several verses speak of painted forms of decoration that have but rarely survived on wood and stone. The 9th century skald poet Bragi Boddason, for example, cites four apparently unrelated scenes painted on a shield. One of these scenes depicted the god Thor's fishing expedition, which motif is