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Franco Banfi captures sperm whales sleeping vertically | Daily Mail Online
Sperm whales sleep vertically and other interesting facts 'tail-standing' sleeping whales snooze in stunning photo Amazing footage of sperm whales sleeping vertically (video)
How do whales and dolphins sleep without drowning?
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Sperm whales sleep vertically and other interesting facts
How do Whales and Dolphins Sleep Without Drowning? - YouTube
'Tail-Standing' Sleeping Whales Snooze in Stunning Photo | Live Science
Amazing Footage of Sperm Whales Sleeping Vertically (VIDEO) - One Green
Franco Banfi captures sperm whales sleeping vertically | Daily Mail Online