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Many Antarctic creatures, like the dinner-plate-sized sea spiders, have evolved to a gigantic size to cope with the extreme environment.
Photo

Cold-Water Sea Spider

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Despite the cold and dark environment, soft-bodied animals like anemones abound under the ice in the Antarctic.
Photo

Anemone in Cold Antarctic Water

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Chrysaora melanaster is a jellyfish found in the Arctic.
Photo

Arctic Sea Jelly

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Jellies in the Class Hydrozoa are transparent and easily overlooked.
Photo

Transparent sea jelly

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A photo of Oceana's ice class research vessel, the Hanse Explorer, on the Baltic Sea.
Slideshow

Biodiversity in the Baltic Sea

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