The picture on the left is of a caterpillar. This caterpillar fits in with self-mimicry because of its head and tail. The caterpillar only has one head but its tail also resembles a head to distract predators. Having another head gives the caterpillar a 50/50 chance of keeping its head. Without its head the caterpillar would be unable to eat which would eventually kill it. Having "two-heads" is a great way to confuse and distract predators!