Polar Bears: Facts, Population, Habitat & Conservation Status
There’s a reason the polar bear is the face of the Arctic — it’s the largest land carnivore, a master of sea ice, and an animal that stirs both wonder and concern. But the story behind the symbol is more nuanced than a single population number.
Adult Male Weight: 300–800 kg (660–1,760 lb) ·
Estimated Global Population: 22,000–31,000 ·
Lifespan in Wild: 25–30 years ·
Habitat Region: Arctic (Canada, Alaska, Greenland, Russia, Norway)
Quick snapshot
- Polar bears are found only in the Arctic, not Antarctica (U.S. Marine Mammal Commission)
- Adult males weigh up to 800 kg (Wikipedia)
- Global population estimated at 22,000–31,000 (WWF)
- Precise timeline of local extinctions depends on future greenhouse gas emissions
- Exact count in remote subpopulations uncertain due to survey limitations
- Conservation efforts focus on sea ice preservation and reducing emissions (Polar Bears International)
- Continued monitoring of 19 subpopulations by the IUCN/SSC Polar Bear Specialist Group (Polar Bears International)
Eight key facts provide a baseline for understanding the species.
| Label | Value |
|---|---|
| Scientific name | Ursus maritimus |
| Weight (male) | 300–800 kg |
| Weight (female) | 150–300 kg |
| Length (male) | 2.4–3 m |
| Lifespan | 25–30 years |
| Population | 22,000–31,000 |
| IUCN status | Vulnerable (assessed 2015) |
| Main prey | Ringed seals, bearded seals |
What are 5 facts about polar bears?
Size and weight of adult polar bears
- Adult males weigh 300–800 kg, making them the largest land carnivore on Earth (Wikipedia).
- Females are about half that size, typically 150–300 kg.
Polar bears are classified as marine mammals
Because they depend on the ocean for food and spend most of their lives on sea ice, polar bears are often referred to as marine mammals (Wikipedia). The U.S. Marine Mammal Commission lists them as a species of concern.
Polar bear fur is not white but transparent
Each guard hair is hollow and transparent; it appears white because it scatters visible light. The skin underneath is black to absorb heat.
How many polar bears are left?
Current global population estimate
The best available estimate puts the global population between 22,000 and 31,000 individuals, according to the WWF (global conservation organization). That number comes from a compilation of subpopulation surveys by the IUCN/SSC Polar Bear Specialist Group (global authority on polar bear science).
Regional subpopulation trends
The species is divided into 19 relatively discrete subpopulations spanning about 23 million square kilometers (Polar Bear Agreement). Some subpopulations are stable, others are declining as sea ice retreats.
IUCN Red List status
The IUCN (global authority on species status) lists the polar bear as Vulnerable, a classification that reflects an estimated population reduction of more than 30% over three generations, primarily due to sea ice loss.
The 22,000–31,000 figure is not a single count but a modeled estimate. For conservation planners, the key is not the total but the trend: without sea ice, even the most optimistic count will drop.
Are polar bears Arctic or Antarctic?
Why polar bears are found only in the Arctic
Polar bears inhabit the circumpolar Arctic and adjacent subarctic areas, including the jurisdiction of Canada, Greenland (Denmark), Norway, Russia, and the United States (Alaska) (U.S. Marine Mammal Commission). They rely on sea ice to reach seal prey, which is abundant in the Arctic Ocean.
Absence of polar bears in Antarctica
No polar bears live in Antarctica. The continent lacks the sea ice platforms that polar bears need for hunting, and seals there evolved without a large terrestrial predator. The two regions are separated by thousands of kilometers of open ocean.
What eats a polar bear?
Natural predators of adult polar bears
Adult polar bears have no natural predators. Their size, strength, and position at the top of the Arctic food chain mean that nothing hunts them for food.
Threats to cubs
Cubs may be killed by wolves, other polar bears (especially males), or humans. However, the primary threat to all polar bears is habitat loss driven by climate change, which reduces their hunting grounds and forces them closer to human settlements.
“No predators” sounds like a safe position, but it’s misleading. Starvation due to sea ice loss kills more polar bears each year than any predator ever could.
Which is deadlier, a polar bear or a grizzly bear?
Size and strength comparison
Polar bears are larger: males weigh 300–800 kg compared to 180–360 kg for grizzlies. They also have longer skulls and more powerful forelimbs adapted for swimming and pulling seals onto ice.
Four key differences reveal one pattern: polar bears are built for an icy marine environment, grizzlies for a terrestrial one.
| Trait | Polar bear | Grizzly bear |
|---|---|---|
| Weight (male) | 300–800 kg | 180–360 kg |
| Maximum speed | 40 km/h | 50 km/h |
| Aggression toward humans | Opportunistic, especially in food-scarce conditions | Defensive, more frequent due to habitat overlap |
| Attack frequency | Extremely rare (fewer than 1 per year globally) | Higher in North America (dozens per year) |
The pattern is clear: polar bears are built for a marine environment, grizzlies for a terrestrial one — this shapes their behavior toward humans.
Aggression and attack statistics
Polar bears are more likely to view humans as prey when they are nutritionally stressed, whereas grizzly attacks are usually defensive. According to historical records, polar bear attacks on humans are extremely rare but can be fatal. Grizzly attacks are more common, though most are non-lethal.
If you’re hiking in grizzly country, your risk of an encounter is higher. If you’re in polar bear country, the consequences of an encounter are more severe because the bear may see you as a meal.
Will polar bears go extinct by 2050?
Scientific projections for polar bear survival
Some subpopulations — particularly those in the southern part of the range, like the Western Hudson Bay group — could face local extinction by 2050 if current warming trends continue. Global extinction is not projected by that date. The IUCN (global authority on species status) estimates a high risk of extinction by the end of the century if sea ice loss continues unabated.
Role of sea ice in extinction risk
The single most important factor is the extent and duration of Arctic sea ice. Polar bears use sea ice as a platform to hunt seals. As ice-free periods lengthen, bears are forced to fast for longer, leading to reduced body condition and lower cub survival.
Confirmed facts vs. What’s unclear
Confirmed facts
- Polar bears are found only in the Arctic
- Adult males weigh up to 800 kg
- Global population estimated at 22,000–31,000
- Sea ice extent is declining due to climate change
What’s unclear
- Precise
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