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How do Whales and Dolphins Sleep Without Drowning? - YouTube
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Amazing footage of sperm whales sleeping vertically (video) .
'Tail-Standing' Sleeping Whales Snooze in Stunning Photo | Live Science
Amazing Footage of Sperm Whales Sleeping Vertically (VIDEO) - One Green
Apparently, Sperm Whales Dive 45 Feet Into The Ocean And Sleep
Sperm whales sleep vertically and other interesting facts
How do Whales and Dolphins Sleep Without Drowning? - YouTube