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Photograph of a transparent polka-dotted squid in the dark ocean.
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Cockatoo Squid

 This transparent cockatoo squid (Leachia sp.), also known as a glass squid, lives...
Color illustration of an ancient bivalve.
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Elevator Rudists

 These "elevator" rudists, an ancient bivalve, used one long heavy valve to anchor...
Arctic cod have a special protein that warms their blood.
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Arctic Cod Under Ice

 Arctic cod have a special protein that keeps their blood from freezing in ice-cold...