The flounder is the fish that evolution has left behind. One look at it laying in the sand or on a coral head, with its eyes on top of its body, and you would agree with me. An odd looking fish, but a pretty pattern on the body.
Apparently, the juveniles have eyes on both sides of their body and swim upright and as they mature into adults, the right eye creeps toward the left and they lay down to swim. They are great at camouflage and their eyes move independently which helps them hunt.