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Limacina helicina, the sea butterfly, is a tiny mollusk that lives inside a dark shell and uses its "ears" as wings. Like its predator, the sea angel, Limacina has evolved wings in place of the normal mollusk foot. Unlike the sea angel, though, Limacina hunts with a big ball of secreted mucous, which it uses to catch tiny arthropods, bacteria and algae. Photo by Alexander Semenov. Story by Nadia Drake, #Marine_Biology #Sea_Butterfly

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