Swim Like a Butterfly? Sea Snail 'Flies' Through Water

But the sea butterfly, a tiny marine snail, has more in common with flying insects than you might expect, according to a new study. Also known as Limacina helicina, the sea butterfly navigates cold ocean waters in the northern Atlantic and Pacific. Many types of zooplankton, tiny ocean animals, have structures like the sea butterfly's, which they use as paddles to propel themselves through the water.