Pet owners can get their furry friends equipped with RFID chips injected under the skin, so if Fido runs away, whoever finds him can have a vet scan the chip and find the owner is in an online database.

While many people are familiar with the idea of dogs and cats getting chipped, the practice is also used with exotic pets like the Asian arowana fish, above, when there's concern of possible smuggling or sale of wild animals. For these purposes, the chip is a serial number and a guarantee of legal sale.