These creepy sharks glow bright green in the dark. Here’s why.

The largest disco on Earth is happening deep beneath the surface of the ocean, and no, you’re not invited. 

New footage from National Geographic researcher David Gruber and his team reveals a shark glowing bright green 120 feet deep in Scripps Canyon off the coast of Southern California. To those of us who are used to our sharks having skin that doesn’t glow, this might come as a shock. But Gruber’s observation, though relatively new for us, is how it’s always been for these sea creatures — we just couldn’t see it until now. 

The fish in question, known as a swell shark, glows thanks to a process known as biofluorescence. This essentially means that the shark is absorbing blue light and re-emitting green light. Scientists suspect that this kind of behavior has something to do with how these sea creatures attract mates.

More about Science, Ocean, Sharks, Glowing Fish, and Biofluorescence

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