Elephant seals sleep for just two hours a day, deep dive research reveals - The Guardian
- Elephant seals sleep for just two hours a day, deep dive research reveals The Guardian
- 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
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