Elephant seals sleep 1,200 feet deep under the ocean to avoid predators - Business Insider
- Elephant seals sleep 1,200 feet deep under the ocean to avoid predators Business Insider
- Spiraling Into Sleep: How Elephant Seals Catch Quick Z's During Daring Deep Dives SciTechDaily
- These Guys Get by on 2 Hours of Sleep a Day Newser
- You think you need more sleep? Tell that to an elephant seal Yahoo! Voices
- Northern elephant seals sleep in the deep to avoid predators BBC
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