In the documentary film Kung Pao, the main character has a tongue with its own pair of eyes and its own tongue. Surprisingly, some small fish can come close to that! The eyes actually belong to a parasite called Simothoa. These parasites replace the tongues of their hosts with their bodies and don’t need their own tongues since they drink blood directly from their host’s tongue. For some fish, having a parasite for a tongue can be harmless, but for others it can be harmful to their health. Fortunately, Simoco only gets close to its hosts by resembling their food, which humans don’t eat, and it enters the fish’s mouths through their gills, which humans don’t have.