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
Willie Smits impressed both by the orangutans themselves and by Smits' work in rescuing and rehabilitating them: "There are books that can be published, and books that have to be published." Smits and his work appeared in a number of documentaries, including: Willie Smits Willie Smits (born February 22, 1957, in Weurt, Gelderland, the Netherlands) is a trained forester, a microbiologist, conservationist, animal rights activist, wilderness engineer and social entrepreneur. He has lived in Borneo since 1985 and is an Indonesian citizen. While working as a forest researcher in East Kalimantan, Indonesia in 1989, Smits encountered a baby orangutan in a cage