Meet the animals and birdlife that endure the darkness, cold, and scarcity of winter in the Arctic archipelago of Svalbard, shaped by evolution to survive months of polar night.
I went to Svalbard last month primarily for the landscapes and to meet the people. But it was some of the other residents that turned out to fascinate me most.
There isn’t much in the way of species diversity this far north. That is hardly surprising, given the long winters, deep cold, and months of complete darkness.
Yet the species that do call Svalbard home are among the most specialised and resilient animals on Earth.
They survive with limited food, extreme cold, and long periods of darkness by using a combination of fat reserves, behavioural adaptation, and remarkable evolutionary traits.
Winter strips life here back to its essentials, making Svalbard an extraordinary place to observe nature operating at its limits.
Surviving the Arctic Winter
Most bird species entirely abandon Svalbard during winter, migrating south in search of light and food. Only a handful remain, and even fewer live on land year-round.
The Svalbard rock ptarmigan is the sole land-based bird to stay through the polar night. Among seabirds, only species such as the common eider, long-tailed duck, and black guillemot are hardy enough to remain.
With round-the-clock darkness and landscapes locked under snow and ice, the biggest challenge is not cold but access to food. Plants are buried, insects are absent, and the marine food web is restricted by sea ice.
The animals that remain have adapted in different ways. The Svalbard reindeer, Arctic fox, and rock ptarmigan all build up substantial energy reserves during the short summer and autumn.
Thick layers of fat and insulating fur or feathers allow them to conserve heat and survive long periods with little nutrition. Many species also reduce activity levels during winter to conserve precious calories.
Polar Bears
Ursus maritimus is the undisputed king of the Arctic. Despite declining numbers across much of the polar region, Svalbard still supports a substantial population.
At last count, there were estimated to be up to 3,000 polar bears in the Svalbard area, meaning there are still more bears than people.
Polar bears are classified as marine mammals because they spend most of their lives on sea ice, hunting seals. They are powerful and efficient swimmers, capable of crossing long stretches of open water.
In one well-documented case, a bear was tracked swimming a 70-kilometre fjord crossing in just 24 hours.
They are most commonly sighted along the east coast of Spitsbergen, the largest island in the archipelago, where sea ice tends to be more stable. However, polar bears roam widely, and the northern fjords are also favoured habitats.
For all their beauty, polar bears are dangerous apex predators. Adult males can weigh up to 800 kilograms. In this environment, humans are the visitors, and a hungry bear may see people as potential prey.
This is why anyone travelling outside settlements must carry polar bear protection and understand how to use it.
Svalbard Rock Ptarmigan
The Svalbard rock ptarmigan is the only land-dwelling bird species that lives on Svalbard year-round. In winter, it develops a striking white plumage that provides near-perfect camouflage against snow-covered terrain.
This subspecies is larger and heavier than both the rock ptarmigan and willow ptarmigan found on mainland Norway. Adult birds grow up to 40 centimetres long and weigh between 490 and 1,200 grams, depending on the season.
Much of this weight gain occurs during summer and autumn, allowing the birds to survive the long winter.
Hunting is permitted under strict regulation, with around 1,000 birds taken annually in central and northern parts of Spitsbergen.
Population monitoring is carried out by the Norwegian Polar Institute, which tracks males’ territorial calls during the spring breeding season.
Climate change poses a growing challenge. Increasing numbers of geese, drawn north by milder summers, now compete with ptarmigans for key grazing plants. Over time, this added pressure may affect population stability.
Svalbard Reindeer
Svalbard reindeer behave very differently from their mainland relatives. Rather than moving in large herds, they live alone or in small groups, making large gatherings rare.
They are smaller, rounder, and more compact than mainland reindeer, an adaptation that helps reduce heat loss. Males are slightly larger than females, and each doe gives birth to a single calf per year.
With no natural land predators, survival depends almost entirely on weather conditions and access to food.
During summer, reindeer graze almost continuously, sometimes gaining up to 10 kilograms in body weight. These fat reserves are essential for winter survival, when vegetation is scarce and often sealed beneath ice.
In particularly harsh winters, rain followed by freezing temperatures can encase tundra plants in solid ice, preventing reindeer from reaching food. In such years, starvation can claim many animals.
While Arctic foxes do not hunt reindeer, they readily feed on carcasses left behind.
Arctic Fox
The Arctic fox is one of Svalbard’s most adaptable predators. During winter, it often follows polar bears to scavenge leftovers from seal kills. It also hunts ptarmigans and relies heavily on food cached earlier in the year.
As daylight returns, the fox turns its attention to seabird cliffs and nesting geese on the tundra.
Both white and blue Arctic foxes are found on Svalbard. White foxes dominate, with thick white winter coats that change to grey-brown in summer. Blue foxes retain darker colouring year-round, ranging from brown to bluish-grey.
Arctic foxes mate for life and defend their territory. A vixen typically gives birth to five or six cubs in May. The young develop quickly and are largely independent within a few months, a necessary adaptation in such a demanding environment.
The Ringed Seal
The ringed seal is the most abundant seal species in Svalbard waters and forms the foundation of the polar bear’s diet. Seal pups are also vulnerable to Arctic foxes, particularly in spring.
To survive the Arctic climate, ringed seals excavate snow-covered lairs on top of sea ice. They maintain breathing holes using the claws on their front flippers and give birth inside these protected spaces.
Ringed seals feed primarily on Arctic cod. Adults typically grow to over one metre in length and weigh between 50 and 100 kilograms. Females can produce one pup per year from around five years of age.
The oldest recorded ringed seal in Svalbard reached an impressive 45 years.
Other Key Species in Svalbard’s Winter Ecosystem
While polar bears, reindeer, and Arctic foxes tend to dominate attention, Svalbard’s winter ecosystem depends just as much on less visible species, particularly those tied to the sea.
The walrus is one of the most striking marine mammals found around the archipelago. Once heavily hunted, walrus numbers around Svalbard have slowly recovered under strict protection.
In winter, they are most often found along the coast, hauling out on sea ice or rocky shores where they rest between feeding dives.
Their bulk and social behaviour make them especially vulnerable to disturbance, which is why strict approach distances now apply to vessels and people alike.
Bearded seals are another important, though less frequently spotted, species. Larger than ringed seals, they favour shallow coastal waters where they feed on clams and other bottom-dwelling organisms.
Their presence supports polar bears while also reflecting the health of nearshore marine habitats.
Beneath the ice, Arctic cod form the backbone of the winter food web. These small fish feed on plankton and, in turn, sustain seabirds, seals, and ultimately polar bears.
Without Arctic cod, much of Svalbard’s wildlife simply could not survive. Although rarely seen by visitors, their role is fundamental.
Together, these species highlight an important reality of Arctic life. Even in winter, when the land appears frozen and lifeless, Svalbard remains deeply connected to the sea.
Much of its wildlife survives not on what can be found on land, but on the complex and fragile ecosystem hidden beneath the ice.
Wildlife Protection Rules and Travel Restrictions
In recent years, Norway has significantly tightened wildlife protection rules in Svalbard in response to increased tourism and growing environmental pressure.
Cruise ships and expedition vessels must now maintain strict minimum distances from wildlife, including polar bears, walruses, seals, and nesting birds. These distances are greater than in the past and vary depending on species and season. Approaching wildlife, whether on land or from the sea, is tightly regulated.
Many landing sites are subject to seasonal closures to protect breeding birds and marine mammals. Drone use is heavily restricted and, in many cases, prohibited due to its documented impact on animal stress and behaviour.
For visitors, these rules mean fewer close encounters but a more responsible and sustainable form of Arctic travel. For wildlife, they offer vital protection at a time when climate change is already transforming the Arctic faster than almost anywhere else on Earth.
If you are planning a winter trip to Svalbard, understanding and respecting these regulations is essential. Not only are they legally enforceable, but they also play a crucial role in preserving the remarkable wildlife that makes this remote archipelago so special.
