Sleep is universal in the animal kingdom, but each species slumbers in a different — and often mysterious — way. Some animals snooze with half their brain, while others only sleep for two hours a day (without even suffering sleep deprivation!)…

So how do elephants, sloths, dolphins, wild horses, little brown bats, and other animals sleep? Science writer Ed Yong explains in this episode of The Atlantic‘s new animated Animalism series on Facebook.

Here’s another: How Animals See the World, an exploration of how animals “evolved eyes in incredibly diverse ways and for different purposes.”

Next, more videos about eyes and more videos about sleep: The benefits of a good night’s sleep. How do animals see in the dark? And why do we sleep and how do different animals sleep?

Bonus: The Snail-Smashing, Fish-Spearing, Eye-Popping Mantis Shrimp.

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