PHOTOS: Odd, Identical Species Found at Both Poles

PHOTOS: Odd, Identical Species Found at Both Poles
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Up to 1.6 inches (4 centimeters) long, Clione limacina,--a shell-less pteropod, or swimming snail--preys exclusively on its "cousins": shelled pteropods such as Limacina helicinia (see previous photo).

A series of "often perilous" sea voyages in 2007 and 2008 found that this species and 234 others live on both the Arctic and Antarctica, scientists announced February 15, 2009.

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—Photograph courtesy Russ Hopcroft, University of Alaska Fairbanks, Census of Marine Life
 
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