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An Arctic fox travelled 3506 kilometres over sea ice and glaciers last year during a 76-day polar marathon. Biologists documented the journey, which began on the island of Spitsbergen in the Svalbard archipelago, and ended on Ellesmere Island in Canada’s remote Nunavut Territory.

“Crossing extensive stretches of sea ice and glaciers, the female moved at an average rate of 46.3 kilometres a day,” says the study’s co-author Eva Fuglei at the Norwegian Polar Institute. “The maximum movement rate was 155 kilometres a day and occurred on the…