Bizarre snail that swims like a flying insect

Snails usually lumber along on their single fleshy foot; but not sea butterflies (Limacina helicina). These tiny marine molluscs gently flit around their Arctic water homes propelled by fleshy wings that protrude out of the shell opening. But little was known about how they move through water. "Most zooplankton swim with a drag-based paddling technique," explains David Murphy from the Georgia Institute of Technology, USA, and even though one of Murphy's thesis advisors - Jeannette Yen - had film