A tunnel to the Twilight Zone

A tunnel to the Twilight Zone

When you’re hungry, wouldn’t it be nice to just slip into a tunnel that rushes you off to a grand buffet? It sounds like something Elon Musk might dream up, but it turns out, certain species of sharks appear to have this luxury. Now, according to a new study in Proceedings of the National Academy of Sciences (PNAS), scientists are seeing a similar activity with blue sharks, which dive through these natural, spinning tunnels at mealtime. The eddies draw warm water deep into the twilight zone where temperatures are normally considerably colder, allowing blue sharks to forage across areas of the open ocean that are often characterized by low prey abundance in surface waters. To track their movements, the researchers tagged more than a dozen blue sharks off the Northeast Coast of the U.S. and monitored them for a period of nine months.

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