Arctic Wolf (Canis lupus arctos) lives in arctic tundra across Northern Arctic. It feeds on small mammals lemmings. Its conservation status is Least Concern.
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Arctic wolves never leave the treeless tundra; they spend their whole lives north of the northern treeline. They are a medium-sized subspecies that differs from the northwestern wolf by being smaller, whiter, having a narrower braincase and larger carnassials.
On Ellesmere Island the wolves show little fear of people, approaching humans with cautious curiosity. They are relatively unafraid and can be coaxed to come closer, as noted when a pair of scientists were approached by six wolves and one even leapt at a researcher.
Since 1930 Arctic wolf skulls have steadily become smaller, a trend scientists link to hybridisation with dogs. The progressive reduction in size is evident across the subspecies and reflects recent genetic mixing.
Arctic wolves only migrate during the polar night, when the sun never rises and darkness lasts a full 24 hours. This seasonal movement is the sole period when they travel long distances, and the perpetual darkness makes tracking their routes especially challenging for researchers. A winter study conducted about 2,250 km south of the High Arctic, in temperatures as low as −53 °C, illustrates how difficult it is to observe these movements in complete darkness.
Polar bears are seldom seen by Arctic wolves, yet there are two documented instances where wolf packs have killed polar bear cubs. These rare attacks represent some of the few recorded predator-prey interactions between the two Arctic apex species, highlighting an unusual but notable overlap in their ecological niches. Such events are exceptional given the general avoidance between the two large carnivores.
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The Arctic Wolf is a subspecies of the grey wolf found exclusively in the High Arctic tundra of Canada and Greenland, where it endures some of the harshest conditions on the planet. Smaller than mainland wolves, its compact body and thick double-layer coat are masterful adaptations to temperatures that regularly plunge to −40°C and below. Its pure white pelage provides perfect camouflage against the snow, making it both an effective ambush predator and nearly invisible to prey. Unlike virtually all other large predators, the Arctic Wolf has been spared the persecution that has driven other wolf populations to extinction, owing entirely to the inaccessibility of its domain. Most of what we know about this subspecies comes from a handful of multi-decade studies conducted by biologists who spent months camped in the High Arctic, often the first humans the wolves had ever seen.
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