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Forget everything you ever learned in Biology class about all fish being cold-blooded. Last week researchers from the National Oceanic and Atmospheric Administration (NOAA) have discovered a fish living deep in the Pacific Ocean that is truly warm-blooded.  Unlike other fish, NOAA determined that the opah (Lampris guttatus), or "moonfish", actually generates heat as it swims and then distributes the heat throughout their bodies through special blood vessels. The discovery was made after researchers found special "counter-current heat exchangers" in the fish's gills, which minimizes heat loss at the chilly depths the opah is known to swim to. This discovery...

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