235 same species found at both ends of Earth _English

A swimming snail (Limacina helicinia) that lives in both Arctic and Antarctic waters is seen in an undated handout picture. The snail is one of 235 cold-loving species found in both polar regions in a puzzle for scientists about how they reached both ends of the world.

A swimming snail (Limacina helicinia) that lives in both Arctic and Antarctic waters is seen in an undated handout picture. The snail is one of 235 cold-loving species found in both polar regions in a puzzle for scientists about how they reached both ends of the world. (Xinhua/Reuters Photo)
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