I am a fishophile the way many of you are birdophiles. If this were some kind of competition I would point out how my clan (fish) are the most varied of vertebrates ... way more species than all the other stiffback clans together. I might point out that by percent of body weight, fish are the most muscular of vertebrates and I could even point to the fact that they were here a gadzillion years before our feathered friends.
That's a lot of pointing.
If I were not tired of pointing out the extreme coolness of fish, I might just point to the flounder and sit back smugly with my fins folded across my chest.
Consider the flounder. He's a compressed (flattened side to side) fish. Nothing weird about that, but the flounder is a bottom dweller (demersal) and lies flat on the bottom. Not on his belly, but on his side.
As you probably already know, flounders are born with normal eye position, but while still very young, the eye on the bottom side migrates to the topside. The flounder in the picture is so young and semitransparent that you can see into his skull. His eye has already migrated and it LOOKS like you can see the channel it traveled. I'm not sure if that is accurate, but it sure looks that way.
What you can't see in that photo, because they are so tiny, is the dagger like teeth this very aggressive predator is toting in his mouth. Flounder are ambush predators of their fellow fish and other small animals and they need long sharp teeth to hold their struggling prey.
If you are careless getting the hook out of a flounder's mouth, you will always remember the pain. I do.
In fact, I've had to remember it a couple of times.