Elephant seals enter 'sleep spiral' during deep ocean dives - CNN
- Elephant seals enter 'sleep spiral' during deep ocean dives CNN
- You Won't Believe How Elephant Seals Sleep Underwater Gizmodo
- Seals Survive on Two Hours of Sleep. Why Can't We? The Atlantic
- Elephant seals run on just 2 hours of sleep while foraging, study reveals The Washington Post
- Elephant seals sleep for just two hours a day, deep dive research reveals The Guardian
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