How Sea Butterflies “Fly” in Water

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 simple… Meet Limacina helicina, an artic-dwelling sea butterfly that flies through the water.

Hosted by: Hank Green

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Image Sources:
Image from page 62 of "American malacological bulletin" (1983)

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