Elephant seals amaze scientists with their ability to sleep 1,200 feet deep under the ocean to avoid predators

Elephant seals amaze scientists with their ability to sleep 1,200 feet deep under the ocean to avoid predators

Elephant seal sleeping in Antarctica.Sebnem Coskun/Anadolu Agency via Getty Images <ul> <li>Elephant seals drift downwards in a "sleep spiral" when deep diving in the ocean, a new study found.</li> … [+3481 chars]

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