The pteropod Limacina helicina is a tiny shelled marine snail that swims using a pair of converted feet as wings. It has earned the name “sea butterfly” because of its elegant swimming style, and “potato chip of the sea” because of its importance as a food source for so many Arctic marine species from zooplankton to seabirds to fish. Limacina helicina starts life as a male and becomes female when it reaches a larger size. It captures its prey by casting a web of mucus that traps tiny plankton.