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.

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Submitted May 15, 2015 at 04:14AM by madam1 http://ift.tt/1EJ6jZF