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• Elephant Seals Take Power Naps During Deep Ocean Dives - The New

Elephant Seals Take Power Naps During Deep Ocean Dives - The New

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Earthguide: Elephant Seals

Elephant Seals Take Power Naps During Deep Ocean Dives - The New York Times

Elephant Seals

Elephant seals enter 'sleep spiral' during ocean dives

Elephant seals take underwater power naps, scientists learn - Talker

Killer gas aids elephant seals' deep dives, Science

Sleeping elephant seals fall through ocean's depths, and some even nap on the sea floor

Dive Into The Depths With Seals - Science Friday

Northern elephant seals sleep just two hours a day at sea