Elephant seals can sleep and dive simultaneously

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Elephant seals can travel for 7-8 months on the high seas, far away from land. In order to get some sleep they developed the ability to dive for some sleep –  they stay for a few minutes on the surface then go for a 30-minute dive, and when they are deep enough to avoid predators they take a 10-minute nap while holding their breath.

 

Photo by: https://unsplash.com/photos/ZMagdVZTryE

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