An arctic tern (Sterna paradisaea) rests on an iceberg floating in Jökulsárlón, the glacier lagoon in Iceland. Arctic Terns have the longest migration of any animal, flying an average of 44,300 miles (70,900 kilometers) each year. They summer in each hemisphere, breeding in the northern polar region during its summer and then flies to the edge of the Antarctic ice for the southern hemisphere summer.
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