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An amphipod within Arctic sea ice.
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Amphipod Under Arctic Sea Ice

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This 1874 illustration of California gray whales (Eschrichtius robustus) shows a group of individuals at the edge of their modern day range in the North Pacific Ocean, blocked from traveling further east into Arctic waters by thick ice barriers.
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In the Arctic, the Times, They Are a-Changin: You Can Pitch in to Understand How

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A team of scientists explore the Arctic ocean.
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Under Arctic Ice

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A narwhal breaches the surface, its tusk pointed to the sky
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Why a Tusk? The real-life unicorns of the sea and the tusks that make them famous

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Diagram of narwhal anatomy and tusk function
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Narwhal Anatomy

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