Polar Bears: Facts on Habitat, Population & Threats

There’s something magnetic about a polar bear—the way it moves across the ice, a speck of cream on an endless white field. But behind that majesty lies a story of survival that gets more urgent every year, pulling together the latest facts, population estimates, and conservation challenges to give you the full picture of where polar bears stand right now.

Largest land carnivore: Adult males 300–800 kg · Current population: 22,000–31,000 · IUCN status: Vulnerable · Primary habitat: Arctic sea ice · Swimming endurance: Up to 100 km nonstop

For a quick reference, here are the polar bear’s vital statistics.

What are 5 facts about polar bears?

Polar bears are built for extremes. Here are the five most important facts that define them.

How big are polar bears?

• Adult males weigh between 300 and 800 kg, with some individuals reaching 1,000 kg. Females are roughly half that size, typically 150–290 kg (WWF UK (wildlife conservation body)).
• Standing up to 3 meters tall on hind legs, they are the largest land carnivore on Earth (The Marine Mammal Center (marine mammal research & rescue)).

What do polar bears eat?

• Their diet is almost exclusively seals, especially ringed and bearded seals (The Marine Mammal Center (marine mammal research & rescue)).
• They are opportunistic scavengers and will also eat carcasses, birds, and vegetation when seals are scarce (WWF (global conservation organization)).

How long do polar bears live?

• In the wild, polar bears typically live 25–30 years, though a well-fed individual can reach 35. In captivity, lifespans are slightly longer (The Marine Mammal Center (marine mammal research & rescue)).

The implication: these five facts paint a picture of a species exquisitely adapted to a vanishing world.

How many polar bears will be left in 2050?

Are polar bears endangered?

• Currently classified as Vulnerable on the IUCN Red List and threatened under the U.S. Endangered Species Act (IUCN Red List (global authority on species status); U.S. Fish & Wildlife Service (federal wildlife agency)).
• Climate-driven sea-ice loss is the principal threat driving the species toward endangerment (IUCN Red List (global authority on species status)).

How many polar bears are there currently?

• The global population is estimated between 22,000 and 31,000 individuals, with the best estimate around 26,000 (IUCN Red List (global authority on species status)).
• Some sources give a tighter range of 20,000–25,000 (The Marine Mammal Center (marine mammal research & rescue)).

Projections for 2050 are sobering. According to the IUCN, if sea-ice loss continues at current rates, some subpopulations could disappear entirely by mid-century (IUCN Red List). The implication: the polar bear’s survival is now a race against the Marine Mammal Commission (U.S. federal advisory body)’s warning that sea-ice decline and prey loss are the species’ primary threat.

What is the polar bear’s only predator?

What is the biggest killer of polar bears?

• The polar bear has no natural predators in the wild. Adult bears are apex predators. However, human activity is the primary cause of mortality—through hunting, pollution, and habitat destruction (IUCN Red List (global authority on species status)).
• Climate change is described as the single biggest threat, as it melts the sea ice polar bears depend on for hunting and breeding (Polar Bears International (polar bear research & advocacy)).
• Orcas have been known to prey on polar bears at very rare occasions, but this is not a significant factor (National Geographic (science and exploration media)).

The implication: the polar bear’s greatest enemy is not a tooth or claw, but a changing climate.

Are polar bears Arctic or antarctic?

Where do polar bears live?

• Polar bears are found exclusively in the Arctic, not Antarctica (WWF UK (wildlife charity)).
• Their range spans five countries: Canada, the United States (Alaska), Russia, Norway (Svalbard), and Greenland (Denmark) (WWF (global conservation organization)).
• Within this range, there are 20 recognized subpopulations (WWF UK (wildlife conservation body)).

What is the polar bear’s habitat like?

• Polar bears live on sea ice—the frozen ocean surface—which they use as a platform for hunting seals, traveling, resting, and denning (WWF (global conservation organization)).
• They are classified as marine mammals because their survival is tied directly to the marine environment (The Marine Mammal Center (marine mammal research & rescue)).

Six polar bear facts, one pattern: their distribution mirrors the seasonal extent of sea ice. Where the ice is, the bears are. The catch: as Arctic sea ice shrinks, so does their range.

Are polar bears aggressive?

Are polar bears dangerous to humans?

• Polar bears are apex predators and can be dangerous, especially when hungry or provoked. However, attacks on humans are extremely rare (National Geographic (science and exploration media)).
• They generally avoid humans, but bears that are food-stressed may approach settlements (WWF (global conservation organization)).

How do polar bears behave?

• Polar bears are solitary animals, except during mating or when a mother is raising cubs (Polar Bears International (polar bear research & advocacy)).
• They are curious and intelligent, but not naturally aggressive toward humans unless they feel threatened or are starving (The Marine Mammal Center (marine mammal research & rescue)).

The takeaway: understanding polar bear behavior is key to coexistence in a warming Arctic.

Polar bear vs brown bear: a comparison

Three bear species, one critical distinction: polar bears are built for ice, brown bears for land. Here’s how they stack up.

The pattern is clear: polar bears are larger but more specialized, making them far more vulnerable to habitat change than their adaptable cousins.

Timeline: key milestones in polar bear conservation

• 1973 – The five Arctic nations sign the Agreement on Conservation of Polar Bears, the first international treaty focused on the species (Polar Bears International (polar bear research & advocacy)).
• 2006 – IUCN reclassifies the polar bear from Least Concern to Vulnerable (IUCN Red List (global authority on species status)).
• 2008 – U.S. Fish & Wildlife Service lists the polar bear as threatened under the Endangered Species Act due to projected sea-ice loss (U.S. Fish & Wildlife Service (federal wildlife agency)).
• 2020 – Accelerated sea-ice loss recorded in the Barents Sea and other regions; some subpopulations show declines (Marine Mammal Commission (U.S. federal advisory body)).
• 2023 – 5-year status review completed by USFWS; threatened classification upheld (U.S. Fish & Wildlife Service (federal wildlife agency)).
• 2050 – Projected disappearance of some subpopulations if current warming trends continue (IUCN Red List (global authority on species status)).

What this means: the timeline is not just history—it’s a countdown. Every data point since 1973 shows the same direction: ice loss accelerating, bears under pressure.

What we know and what’s uncertain

Confirmed facts

• They are found only in the Arctic (The Marine Mammal Center (marine mammal research & rescue)).
• They depend on sea ice for hunting (WWF UK (wildlife conservation body)).
• Climate change is the primary threat (WWF (global conservation organization)).

What’s unclear

• Exact number of polar bears in 2050 (IUCN Red List (global authority on species status)).
• Whether all subpopulations will decline uniformly (WWF UK (wildlife conservation body)).
• Effectiveness of some conservation measures (Polar Bears International (polar bear research & advocacy)).
• Whether polar bears are definitively the largest land carnivores, as some sources qualify the term (WWF UK (wildlife conservation body)).

The pattern: what we know far outweighs what we don’t, and the known facts point to a species in peril.

Voices from the field

“Polar bears are the sentinel species of the Arctic—their health tells us how the entire ecosystem is faring.”

— WWF (global conservation organization)

“The most important polar bear habitats are the edges of the pack ice, where the ocean meets the ice and seals are most abundant.”

— Defenders of Wildlife (U.S. wildlife conservation nonprofit)

“Polar bears are incredibly strong swimmers, covering distances of up to 100 kilometers in a single swim when necessary.”

— National Geographic (science and exploration media)

These expert perspectives reinforce the urgency of the polar bear’s plight.

What this means for the future

Polar bears are not just symbols of the Arctic—they are indicators of a planet in transition. For conservationists and policymakers in Arctic nations, the trade-off is clear: preserve sea ice habitat, or watch subpopulations vanish by 2050. The choice is no longer theoretical; it’s being written in the melting ice.