In a recent publication in Polar Research, the case was shown of a satellite-collared Arctic Fox that was tagged in Spitsbergen on 29 July 217 in the 14th Julibukta in Krossfjord. She stayed in the same area until 1st March 2018 and then walked around Spitsbergen until 26 March 2018, when it headed out on the pack ice and went north and then east. On 16 April it arrived in the northern shores of Greenland, which it left again on 6 June to arrive on Ellesmere Island, Canada on 10 June 2018. In total, the animal walked 4415km in 122 days, an average of 46.3km/day.
Even though I knew foxes would go out on the sea ice to follow Polar Bears and scavenge on the leftovers of their kills, it did surprise me they would cover these enormous distances and move from one island to another.