Twilight zone sharks have special eyes to see in the dark
Washington (UPI) Aug 7, 2014 - Deep in the sea, where the light from above begins to fade out - a vast expanse known as the twilight zone - there are strange glow-in-the-dark sharks. New research shows these sharks possess highly evolved eyes, enabling them to see in the dark and pick up light signals from their bioluminescent friends and enemies. "There are about 50 different shark species that are able to produce ... more

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