Why do devil rays have a heat-exchanger under their brains? Scientists unravel mystery.

July 1, 2014 7:43 PM

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Chilean devil rays, long thought to keep to shallow waters, actually dive to depths of 6,000 feet, scientists have discovered.

The Chilean devil ray has always been considered a shallow-water swimmer, but new research shows that the species frequently dives to depths of more than 6,000 feet (1,800 meters), likely in search of food.

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