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“But no, there are no boats that go so far up in the ice. So we just had to keep up with what the fox did,” she said, according to a translation of a press release on the study.

The vixen travelled an average of 46.3 kilometres per day, and on one day travelled a shocking 155 kilometres as she made her way across Greenland. “This is, to our knowledge, the fastest movement rate ever recorded for this species,” the study said.

“The sea ice plays a key role in the fact that mountain foxes will migrate between areas, meet other populations and find food,” Fuglei told The Guardian newspaper, adding that it was the first time the scientists studied the migration of the Arctic fox in detail between continents and ecosystems.

The researchers monitored the Norwegian fox from March 1 to July 1, 2018 during which she travelled a total 4,415 kilometres.

A similar distance has been recorded for an adult female Arctic fox that traversed nearly 4,600 kilometres within the Canadian Arctic, but it took that fox five-and-a-half months to complete.

Despite her high travel averages, there were two occasions when the Norwegian fox trekked fewer than 10 kilometres in a 48-hour time span. The scientists believe this was either due to bad weather, or that she came across an abundant source of food and stopped to eat.

Though the fox’s Nordic diet consisted of marine birds and life, when she migrated to Canada she feasted mainly on lemmings. In winter, when food is scarce, Arctic foxes tend to survive on the scraps left behind by polar bears.

Photo by Kristin L. Laidre / Norwegian Polar Institute

The fox’s long journey to Canada has also raised concerns over climate change.

“This is another example of how important sea ice is to wildlife in the Arctic. The warming in the north is frighteningly fast,” said Norwegian Minister of Climate and Environment Ola Elvestuen. “We must cut emissions quickly to prevent the sea ice from disappearing all summer.”

Sadly, after her record-breaking trip, the fox’s final fate is unknown; in February of this year, her tracker stopped working.