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During the Renaissance Era, Sailors Thought Monsters Stalked the Seas

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Vote up the strangest, most imaginative ocean dwellers Renaissance sailors worried they might meet on the high seas.

In the sixteenth century, everyone told stories about Renaissance sea monsters, the terrifying creatures that attacked sailors. In 1539, a Swede named Olaus Magnus tried to explain the mysterious creatures of the North Sea to a group of Italians in a detailed map called the Carta Marina. Magnus filled the water with strange and imaginative creatures people believed in during the Renaissance. 

From the sea pig to the enormous sea serpent, Magnus’s sea monsters were terrifying to sailors. On the map, they smash ships and crush sailors. But some of Magnus’s sea monsters, like the “sea rhinoceros,” definitely qualify among the most inaccurate historical drawings of animals. And other sea monsters were clearly made up sea creatures people really believed in, like the sea cow, which looks more like a drowning ox. 

Sea monsters can be horrifying, but they can also seem pretty silly, like the sailors who mistook a whale for an island and lit a fire on his back. Here are the most terrifying, strangest sea creatures that Olaus Magnus promised lived in the ocean. 

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