Fish heads, fish heads, roly-poly fish heads... Not sure if you remember that song or not, but it seemed like an appropriate intro for this topic - a fish that can look around easily because it has a clear head!
Since the eyes can rotate up, down, and all around, the "barreleyes" fish can be alert for both predators and dinner without needing to move its body, which comes in handy if it happens that you're not particularly agile and have few other defense mechanisms.
That said, this is one freaky-looking fish.
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