The Opah is the first and only fully warm blooded fish currently known. There are others that can warm parts of their body, but the Opah is alone in being able to warm its whole body to temperatures exceeding the surrounding water by about 5 degrees Celsius.
We don't know much about it because it lives its whole life in the open ocean at meopelagic depths.
This is a recent discovery, so I obviously didn't read about it in my encyclopedia. But, I thought it was so awesome that I had to mention it.
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