Aerial view of Jellyfish LakeCaptured from under the serene waters of Palau's famous Jellyfish Lake (aerial view at right), this immersive video is a testament to how amazing the natural world can be. Every day, thousands of these adorable gelatinous creatures — mostly golden jellies, but also sometimes moon jellies — migrate about one kilometer from one end of the lake and back again.

According to Coral Reef Research Foundation, the jellyfish make this twice-daily migration to "avoid capture by the predatory sea anemone Entacmaea medusivora. Swimming east in the morning and west in the afternoon ensures the jellies always encounter a shadow before the actual side of the lake. Staying out of the shadows keeps them away from the edge where this major predator lurks."

Other than the sea anemone, there aren't really any other predators in the lake — an environmental condition that has caused the loss of the jellies' stinging abilities over thousands of years. That's why it's possible for humans to swim in a thick bloom of them without fear of being injured.

For mikeyk, the creator of the video, the experience of "swimming with literally millions of jellyfish was absolutely surreal — a reminder that there will always be surprises out there!"

Jellyfish lake and diver

Photo: Ethan Daniels/Shutterstock

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Catie Leary is a photo editor at Mother Nature Network. Follow her on Twitter and Google+.

Catie Leary ( @catieleary ) writes about science, travel, animals and the arts.

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