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sleeping sperm whales sleeping

https://www.livescience.com/59910-sleeping-sperm-whales.html?utm_source=notification

Whales in quantity all sleeping vertically. It's eerie seeing them.

"The animals were inactive and unresponsive, even when the scientists approached them in a boat, but all the whales awakened quickly and swam away when the boat brushed against one of them and woke it up, the study authors reported.

Further observations revealed that the sperm whales entered these sleeping states by first descending head-down to a depth several times that of their bodies, then passively turning head-up and drifting closer to the surface. The findings showed that sperm whales around the world practice this vertical sleeping posture — but infrequently, spending only about 7 percent of their time asleep, ..."


Whales shifters with their pod?
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