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Check out Nature: Spy in the Wild 2 on PBS ( to follow more than 50 animatronic spy creatures as they go undercover in the animal world. And check out their YouTube channel ( for more great videos of the natural world.

Birds fly, and fish swim. We learn this when we are children. But not everything in nature is quite so simpleā€¦ Meet Limacina helicina, an artic-dwelling sea butterfly that flies through the water.

Hosted by: Hank Green

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