- The car-tire-size opah is striking enough thanks to its rotund, silver body. But now, researchers have discovered something surprising about this deep-sea dweller: It's got warm blood. That makes the opah (Lampris guttatus) the first warm-blooded fish every discovered. http://www.scientificamerican.com/article/first-warm-blooded-fish-discovered/ 65 comments worldnews
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