The Arctic fox, or fjällräv in Swedish, lives in the Arctic and sub-Arctic regions of the northern hemisphere, is an endangered species in Scandinavia, where populations are critically low.
Last year, a record 88 kits were born in the Swedish mountains, reports Swedish Radio News in Norrbotten. However, this year, only seven have been born.
This has not come as a surprise to researchers involved in protecting the Arctic fox.
"It was expected as we had a violent crash in the small rodents population beginning last year," says Stockholm University Zoology professor Anders Angerbjörn, to Swedish Radio News in Norrbotten.
Stocks of Arctic fox fluctuate in a cycle in tandem with the population of lemmings and voles (a 3- to 4-year cycle), which are the main food source of the predators.
In the past, longer sustained periods without a regular supply of the small rodents, coupled with hunting, now illegal, led to the Arctic fox becoming critically endangered in Norway and Sweden.
Several projects are in operation in both countries helping to supplement food supplies and Anders Angerbjörn hopes that they can make a difference.
"As long as we get nice four-year-cycles of small rodents we can, with our various measures, support the Arctic fox population, so that it is regularly increasing," he tells Swedish Radio News.
Today, there are between 150 and 200 Arctic foxes in Sweden.