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 raid warfare and tactics been challenged was entitled to the first blow at the shields. The opponent could parry the blow and counter with his own strike; only one strike at a time was allowed. Once all of someone's shields had been destroyed he could continue to defend himself as best he could with a sword. This would continue until someone was injured; if blood fell on the animal hide then that person was required to pay three marks of silver to be set free and have his honor restored. The most common weapon in the Viking arsenal was the spear. They were inexpensive