Polar Bear Facts, Size, and Conservation Status

There aren’t many animals that make you stop and stare quite like a polar bear — part predator, part Arctic icon. But beyond the white coat and the reputation, there’s a creature built for one of the harshest environments on Earth, and one that’s facing a future shaped by climate change. This article walks through the facts that matter most: how big they really are, how they stack up against grizzlies and Kodiak bears, and what the current science says about their population and survival.

Adult Male Weight: 300–800 kg (660–1,760 lb) ·
Current Global Population Estimate: 22,000–31,000 (IUCN 2023) ·
Top Speed on Land: 40 km/h (25 mph) ·
Olfactory Range (seal prey): Up to 1 km (0.6 mi) ·
Primary Habitat: Arctic sea ice (Canada, Alaska, Greenland, Russia, Norway)

Polar bears are built for the extreme Arctic environment—here are the numbers that define them.

What are 5 facts about polar bears?

Fact 1: Polar bears are the largest land carnivore

• Adult males weigh 300–800 kg (Biology Insights (zoology site)).
• This makes them the largest extant bear species (World Wildlife Fund).

Fact 2: They are classified as marine mammals

Scientific consensus places Ursus maritimus among marine mammals because it spends most of its life on sea ice and depends on the ocean for food (U.S. Marine Mammal Commission).

Fact 3: Their diet is almost exclusively seals

Ringed and bearded seals make up the bulk of their prey (WWF Arctic). A single seal can provide days of energy.

Fact 4: They can swim for days at a time

Polar bears have been recorded swimming continuously for up to 100 km (Polar Bears International).

Fact 5: Climate change is their primary threat

The IUCN lists the species as Vulnerable, with sea ice loss identified as the single biggest threat to survival (Polar Bears International).

Bottom line: The polar bear is built for the Arctic: huge, marine-adapted, and utterly dependent on sea ice. Without it, the species cannot sustain itself.

How many polar bears are left?

Global population estimates

The widely accepted range is 22,000–31,000 individuals, with the IUCN estimating roughly 26,000 (Polar Bears International; World Wildlife Fund). The U.S. Marine Mammal Commission reports around 23,000, citing Hamilton and Derocher (2018).

Regional subpopulations and trends

• 19 recognized subpopulations (U.S. Marine Mammal Commission).
• WWF reports 4 subpopulations declining, 2 increasing, 5 stable, 8 data-deficient (World Wildlife Fund).
• The Southern Beaufort Sea population sits at about 900 bears; the Chukchi/Bering Seas at about 2,000 (U.S. Marine Mammal Commission).

IUCN classification and data sources

Listed as Vulnerable. Climate-driven sea ice loss remains the dominant threat, and some subpopulations suffer from data deficiency, making precise counts difficult (WWF Arctic).

The pattern: Global numbers are stable enough to avoid “endangered” status, but regional declines and data gaps mean the outlook varies heavily by location.

What’s bigger, a Kodiak bear or a polar bear?

Average weight and length comparison

Polar bears tip the scales at 300–800 kg, while Kodiak bears average 300–680 kg. In length, polar bears reach 2.4–3.0 m; Kodiaks are slightly shorter (Biology Insights).

Maximum recorded sizes

Exceptional Kodiak bears can match smaller polar bears, but on average the polar bear holds the size crown. The largest polar bear on record reportedly weighed over 1,000 kg.

Geographic factors influencing size

Kodiak bears live on the Kodiak Archipelago in Alaska, where abundant salmon supports large body sizes. Polar bears, by contrast, rely on high-fat seal meals that allow massive weight gain.

The comparison is close, but the polar bear is generally larger on average.

Is a polar bear vs. grizzly bear?

Size and weight differences

Adult male grizzlies weigh 180–360 kg (coastal populations can exceed 400 kg), while polar bears are heavier across the board (Biology Insights). Grizzlies are shorter and stockier.

Geographic ranges and overlap

Polar bears occupy Arctic sea ice; grizzlies live in inland and coastal areas of North America. In recent years, climate change has pushed grizzlies north, creating a narrow overlap zone.

Aggression and fighting ability

Grizzlies have stronger forelimbs and longer claws for digging, while polar bears have a size and weight advantage (Field & Stream (outdoor sports magazine)). In a hypothetical fight, the outcome is far from certain.

Hybridization: ‘grolar bears’ or ‘pizzly bears’

Rare hybrids have been documented in the wild, confirmed through genetic testing. These offspring show intermediate traits.

The implication: size alone doesn’t determine the outcome in a polar bear vs. grizzly encounter.

What are the top 3 biggest bears?

Three bears dominate the size rankings, all weighing over 300 kg on average.

Why this matters: All three are subspecies of brown bear or the closely related polar bear, highlighting how geography and diet shape extreme size.

What is the most aggressive bear ever?

Aggression ranking among bear species

Grizzly bears are responsible for the most fatal attacks in North America (Field & Stream).

Polar bear aggression toward humans

Polar bears can be predatory toward humans because they see people as potential prey, but encounters are rare due to low human density in the Arctic.

Grizzly and black bear attack statistics

Black bears are generally less aggressive and more easily scared off. Most bears actively avoid humans; attacks are statistically rare.

Factors that influence bear aggression

Hunger, protection of cubs, surprise encounters, and food conditioning can all trigger aggression. Polar bears, unlike grizzlies, may not have a strong fear of humans.

The trade-off: Grizzlies attack more often because they share more habitat with humans, but a polar bear that decides to approach is more likely to treat a person as prey.

Who would win, hippo or polar bear?

Size and defensive capabilities

Hippos weigh 1,500–3,200 kg — three to four times heavier than even a large polar bear. Their thick hide and powerful jaws offer near-impenetrable defense.

Bite force and weaponry

Hippos deliver a bite force estimated at over 800 kg per square inch, with tusks up to 50 cm long. A polar bear’s claws and canines are formidable but outclassed in raw power (Field & Stream).

Habitat and behavior differences

Hippos are semi-aquatic and extremely territorial; polar bears are marine hunters. In a land encounter, the hippo’s aggression and sheer mass make it the heavy favorite.

The verdict: The polar bear’s agility and experience as a predator aren’t enough to overcome a 3,000 kg adversary. The hippo wins.

The pattern: size disparity determines the outcome in this extreme matchup.

Clarity check: What we know and what remains uncertain

The evidence confirms that while polar bears hold the size crown, their future hinges on climate action.

Expert perspectives

“Polar bears have been recorded swimming continuously for up to 100 km.”

— Polar Bears International (specialist conservation organization)

“The polar bear is listed as Vulnerable with an estimated population of 22,000–31,000.”

— IUCN Red List (via Polar Bears International)

The consistent message from the two most authoritative polar bear sources is clear: population numbers sit in the tens of thousands, but the dependency on dwindling sea ice makes the species’ future precarious.

Summary

Polar bears remain the heavyweight champions of the bear world, but their reign is tied to an ecosystem in rapid transformation. For conservationists and policymakers, the choice is stark: cut emissions to preserve sea ice, or watch one of the Arctic’s defining species slide toward regional extinctions. For the global community, the implication is clear: act on climate, or lose the bear.

Frequently asked questions