Polar bears are shaped by a life spent between sea ice and Arctic shores. These ten facts explain where they live, how they hunt and raise cubs, and why changing ice conditions matter to anyone learning about the species or its future.
1. Sea Ice Is Their Essential Habitat
Polar bears live across the Arctic, but sea ice is the central platform for much of their life: it lets them travel over water and reach the seals they hunt. The ice is not a fixed landscape; it forms, shifts, breaks apart, and melts with the seasons, so bears must move as usable hunting areas change. They are classified as marine mammals because their survival depends closely on this ocean environment, even though they also spend time on land.
Sea ice gives bears access to breathing holes and resting places used by seals, especially ringed seals, their most important prey across much of the range. When ice retreats from a coast, a bear may be left on land far from its usual hunting grounds. Understanding the ice as habitat—not simply a frozen backdrop—helps explain the species’ movements, feeding patterns, and vulnerability to warming.
2. Their Range Circles the Arctic
Polar bears occur in the circumpolar Arctic, in areas belonging to Canada, the United States, Greenland, Norway, and Russia. Their range includes the Arctic Ocean and nearby seas, coastlines, islands, and seasonal ice zones; it does not mean that bears occupy every Arctic place year-round. Different populations use different regions, and their boundaries can cross national borders because bears follow habitat and prey rather than political lines.
In Canada, bears are found in several Arctic and subarctic regions, including Hudson Bay and the Canadian Arctic Archipelago. In Alaska, they use the Beaufort and Chukchi seas, while the Svalbard region of Norway and parts of Greenland and Russia also support bears. These regional differences matter: the timing of ice loss, the length of the open-water season, and access to prey are not identical everywhere.
3. Seasonal Ice Shapes Their Movements
As winter sea ice expands, many bears can travel farther across the frozen ocean in search of seals; as it retreats in spring and summer, their options change. Some populations follow the ice northward, while others spend part of the year on land when the ice disappears from their coastal range. A bear’s route can therefore be tied to the seasonal position of the ice edge, the availability of prey, and conditions in its particular region.
Movements are not identical for every bear or every population. For example, bears around Hudson Bay typically come ashore when the bay’s ice breaks up and return to the ice when it forms again, whereas bears in areas with year-round or longer-lasting ice may remain offshore for more of the year. This seasonal pattern is useful context when interpreting sightings: a bear on land is not necessarily lost, but it may have fewer chances to hunt seals there.
4. Seal Hunting Drives Their Daily Life
Polar bears are carnivores and rely chiefly on seals, including ringed seals and, in some areas, bearded seals. A common strategy is to wait near a seal’s breathing hole in the ice or to approach a seal resting on the surface; a successful hunt can provide a large, energy-rich meal. Their strong sense of smell helps them locate prey, including seals beneath snow or ice, although finding a scent does not guarantee a successful catch.
Hunting depends on access to sea ice, where seals are available and bears can use these ambush tactics. On land, bears may search for bird eggs, vegetation, or other food, but these items generally do not replace the energy they obtain from seal fat. This explains why the quality and duration of hunting access matter so much: a bear can be physically capable and still struggle if it cannot reach enough prey.
5. Their Bodies Are Built for Cold and Water
Polar bears have thick fur and a substantial layer of body fat that help insulate them in Arctic conditions. Their fur appears white or cream-colored, helping them blend into snowy surroundings, while the skin beneath it is black. Broad, slightly webbed paws help spread their weight on snow and provide propulsion in water; the paws also have rough surfaces that improve traction on slippery ground and ice.
They are capable swimmers and can cross stretches of open water between ice floes or shorelines. Swimming is demanding, however, and a long distance through cold water is not a substitute for having stable hunting habitat. These adaptations make movement through an icy environment possible, but they do not remove the risks of exhaustion, poor hunting conditions, or increasingly long gaps between ice areas.
6. Fasting Can Follow the Loss of Sea Ice
When bears lose access to sea ice, some spend weeks or months on land with limited opportunities to catch their usual prey. In places such as Hudson Bay, the open-water period can mean an extended wait before bears can return to seal hunting. They rely on stored body fat during fasting, and the ability to build those reserves depends in part on how much food they obtained during the preceding hunting season.
Not every bear experiences the same fasting schedule: it varies by population, age, body condition, and local ice conditions. A bear may eat small amounts of terrestrial food while ashore, but such foods usually provide far less energy than a seal. This distinction is important when people see bears feeding on berries or bird eggs; it shows flexibility, not necessarily that land food can fully replace their marine diet.
7. Pregnant Females Use Snow Dens
Pregnant female polar bears make maternity dens, usually in snow, where they give birth and nurse their cubs in a sheltered environment. Dens are commonly dug on land, often in areas where snow accumulates, though denning locations vary among populations and can include sea ice in some circumstances. The mother generally remains in the den through the coldest period, living on stored fat while the newborn cubs grow.
Denning is a particularly vulnerable stage because the mother cannot forage while caring for her young. The timing and security of suitable den sites matter, as do conditions that allow snow to build and remain stable. Changes in snow and ice patterns can affect access to denning habitat, so protecting the full seasonal landscape is relevant—not only the areas where bears hunt.
8. Cubs Stay With Their Mother for Years
Polar bear cubs are born very small and dependent, usually in winter, and spend their earliest weeks sheltered in the maternity den. When the family emerges, often in late winter or early spring depending on the region, the mother leads the cubs onto the ice or across nearby terrain. She teaches them through experience where to travel and how to behave around potential prey and other bears.
Cubs typically remain with their mother for roughly two and a half years, learning skills they will need to survive independently. The mother provides protection and, during early life, milk; later, the cubs accompany her while she hunts. This long period of care means that a female’s ability to find food affects not just her own condition but also the growth and survival prospects of her offspring.
9. Land Is a Seasonal Refuge, Not a Replacement for Ice
When sea ice is absent, polar bears may rest, travel, or forage along Arctic coasts and tundra. Depending on the place, they can encounter bird colonies, carcasses, vegetation, or human settlements, and some individuals take advantage of foods such as eggs or berries. These behaviors show that bears can make use of varied habitats, but land-based feeding is usually opportunistic rather than an equivalent alternative to seal hunting.
Onshore presence can also bring bears closer to people, especially near communities or waste sites. Local authorities may use measures such as securing attractants and managing encounters to reduce risks to both residents and bears. For visitors, the practical lesson is to keep a safe distance and follow local wildlife guidance; a bear that looks calm is still a powerful wild animal, not an animal to approach for a closer view.
10. Shrinking Sea Ice Is the Main Long-Term Threat
Arctic sea ice has declined as the climate has warmed, reducing or altering habitat that polar bears use to hunt seals. In many regions, earlier spring breakup or later autumn freeze-up can shorten the time available for feeding on the ice. The consequences can include poorer body condition and difficulties for reproduction or cub survival, although effects differ across populations and local conditions.
Climate change is not the only pressure: pollution, human-bear conflict, and industrial activity can also affect bears and their habitat. Still, the close connection between polar bears and sea ice makes ice loss a central concern in assessments of their future. Looking at regional evidence matters, since the pace and impacts of change are not uniform; a single local observation cannot describe the status of every population.
How to Choose
If you are choosing which aspect of polar bear life to study or where to look for reliable information, start with the region and season. A question about summer fasting in Hudson Bay, for example, is different from one about year-round access to ice in parts of the Arctic Ocean. Check that a source identifies the population or location it discusses rather than presenting one group’s behavior as universal.
Next, distinguish habitat facts from individual sightings. Sea-ice conditions, prey access, denning, and cub care help explain broad patterns, while a single bear’s behavior may depend on its age, health, and immediate circumstances. For wildlife viewing, prioritize guidance from local authorities and qualified operators, keep a safe distance, and never approach or feed a bear. These choices make the information more accurate and help protect both people and wildlife.
Frequently Asked Questions
Do polar bears live on land or on sea ice?
They use both, but sea ice is essential for reaching seals and hunting. Bears may spend time on land when ice melts or retreats, with patterns varying by region.
What do polar bears eat?
They mainly eat seals, particularly ringed seals and, in some areas, bearded seals. They may eat other foods when available, especially while on land, but those foods generally do not provide an equivalent substitute.
Can polar bears swim?
Yes. They are strong swimmers and cross open water, but swimming long distances takes energy and does not replace access to suitable sea-ice hunting habitat.
Where do polar bears have their cubs?
Pregnant females make maternity dens, usually in snow on land, though denning locations vary by population. Cubs are born in the den and remain with their mother after the family emerges.
Are polar bears found in Antarctica?
No. Polar bears are native to the Arctic, around the Northern Hemisphere. Antarctica is in the Southern Hemisphere and has no native polar bear population.
Final Thoughts
Polar bear life follows the changing boundary between ocean, ice, and land. Sea ice supports their most important hunting, while seasonal movement, fasting, and family care reflect the challenges of living in a variable Arctic. Understanding those connections makes it easier to see why changes in ice conditions matter—and why regional detail is essential when discussing the bears’ future.