 Dolphins can do it. Chimpanzees can do it. There's a very small list of animals that have passed this mirror test. But about four years ago, scientists published a paper which showed that a little tiny fish, which is called a cleaner rat, which is one of those fish that live on coral reefs, and they're about as long as your finger, and you'll see them because they maintain those cleaning stations when the fish come, so they clean the other fish while they're there. They can recognize themselves in the mirror.