Arctic Fox

The Arctic fox (Vulpes lagopus) is a small canid built for life at the edge of survival. Adults typically weigh between 3 and 8 kilograms, and their dense, multi-layered fur insulates them at temperatures as low as minus 70 degrees Celsius. They range across the circumpolar Arctic tundra, sea ice, and coastal zones of North America, Europe, and Asia, following prey and, in coastal populations, scavenging marine mammal carcasses and seabird colonies. Their seasonal coat shift, white in winter and brown-grey in summer, is one of the most complete camouflage adaptations of any mammal.

The Arctic fox is a keystone scavenger and predator in tundra food webs, cycling nutrients across vast, otherwise low-productivity landscapes. Their primary prey is the lemming, and in years of lemming population crashes their litter sizes shrink dramatically, a direct biological link between predator and prey. The species faces mounting pressure from climate change, which is shrinking sea ice, reducing access to marine food sources, and allowing the larger red fox (Vulpes vulpes) to move northward and displace Arctic fox populations. On a few island populations, particularly in Scandinavia, numbers have fallen sharply enough to require active conservation management, even while the global population remains listed as Least Concern on the IUCN Red List.