Northern elephant seals sleep in the deep to avoid predators - BBC
* Northern elephant seals sleep in the deep to avoid predators BBC
* Elephant seals enter 'sleep spiral' during deep ocean dives CNN
* Northern elephant seals can get less sleep than almost any other animal NPR
* You Won't Believe How Elephant Seals Sleep Underwater Gizmodo
* Seals Survive on Two Hours of Sleep. Why Can’t We? The Atlantic
* View Full Coverage on Google News https://sportbettingbitcoin.com
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