Polar Bears – Complete Guide to Arctic’s Largest Predator

Polar bears are among the most recognizable animals on the planet, yet much of their lives remain hidden beneath a layer of ice and snow. As the Arctic undergoes rapid change, understanding these marine mammals has never been more urgent. This guide covers their size, habitat, diet, conservation status, and the key questions people ask about them.

These large Arctic marine mammals depend heavily on sea ice to hunt seals, breed, and travel. Classified as Vulnerable globally, climate-driven sea-ice loss stands as the main threat to their long-term survival. They are found across the Arctic in Canada, Alaska, Greenland, Russia, and Norway.

Their role as apex predators ties them directly to the health of the entire Arctic marine ecosystem. Changes in sea ice affect not just the bears themselves, but the seal populations they rely on and the broader food web.

How big is a polar bear? A complete size breakdown

• Polar bears are not actually white — their fur is transparent and hollow, reflecting visible light. Wikipedia and NatGeo Kids both confirm this fact.
• Climate change is the single greatest threat: Arctic sea ice declines by roughly 13% per decade, according to WWF and NOAA.
• Despite their size, polar bears can run at 25 mph (40 km/h) and swim continuously for 60+ miles, as documented by WWF and the Marine Mammal Center.
• Males can weigh up to 1,760 lbs (800 kg), making them roughly twice the weight of a grizzly bear. Multiple sources including Wikipedia and WWF support this.
• Their primary prey is ringed seals and bearded seals, both of which are rich in blubber.
• Polar bears spend over 50% of their time searching for food, according to the World Wildlife Fund.
• They are solitary animals with no natural enemies besides humans, as noted by Britannica Kids.

Metric	Male	Female	Cub (Birth)
Weight	800–1,300 lbs (360–590 kg)	300–700 lbs (136–318 kg)	1–1.5 lbs (0.5–0.7 kg)
Length	8–9 ft (2.4–2.7 m)	6–7 ft (1.8–2.1 m)	12–14 in (30–36 cm)
Shoulder Height	4–5 ft (1.2–1.5 m)	3–4 ft (0.9–1.2 m)	N/A
Top Speed (land)	25 mph (40 km/h)	25 mph (40 km/h)	N/A
Swimming Distance	Up to 60+ miles continuously	Same	N/A
Lifespan (wild)	25–30 years	25–30 years	N/A

Based on data from Wikipedia, WWF, Marine Mammal Center.

Are polar bears endangered? Status, threats, and population numbers

The polar bear is listed as Vulnerable on the IUCN Red List, not globally endangered. This designation reflects a high risk of extinction in the wild if conditions do not improve. Conservation groups and park agencies consistently identify climate change and the resulting loss of sea ice as the biggest threat.

How many polar bears are left?

Recent estimates put the global population at roughly 20,000–31,000 bears, depending on the source and the year of assessment. Some sources cite about 26,000 individuals. Population projections warn of major declines if sea-ice loss continues.

How does climate change affect polar bears?

Polar bears rely on the seasonal cycle of sea ice to find seals. As temperatures warm, the ice breaks up earlier in spring and forms later in autumn, shortening the bears’ hunting season. This directly affects their body condition and cub survival rates. Additional threats mentioned by conservation sources include pollution, illegal hunting, and industrial disturbance.

What is WWF doing to help polar bears?

Organizations such as WWF work with Arctic nations to monitor subpopulations, reduce human-bear conflicts, and advocate for policies that curb greenhouse gas emissions. The Circumpolar Action Plan, adopted in 2015, coordinates conservation efforts across all five polar bear range states.

Where do polar bears live? Habitat and geographic range

Polar bears live across the Arctic in places including Canada, Alaska, Greenland, Russia, and Norway. Their key habitat is sea ice and adjacent coastal areas, especially where they can access seals at breathing holes and open leads. They may remain on land during summer when sea ice retreats, but land is a poorer habitat for hunting seals.

What do polar bears eat?

Polar bears are mostly carnivorous and are specialized seal hunters. Their main prey is ringed seals and bearded seals. They also eat other foods when available, including whale carcasses, walruses, beluga whales, birds, fish, terrestrial mammals, and berries. Their diet is heavily dependent on fat-rich blubber, which provides the energy they need in the Arctic. Their survival is closely tied to access to high-fat prey, not just any food source.

Do polar bears hibernate?

Only pregnant female polar bears enter a denning state over winter, typically from October to March. They do not truly hibernate in the way that brown or black bears do. Males and non-pregnant females remain active throughout the winter, hunting on the sea ice.

Are polar bears dangerous? Behavior, diet, and predatory nature

Polar bears are powerful predators and are known to be dangerous. They have an excellent sense of smell and can detect carrion from long distances. They are active predators, often waiting at seal breathing holes or stalking prey beneath the ice. They are generally solitary animals, and adults have no natural enemies besides humans.

Polar bears spend a large share of their time hunting; WWF says they spend over 50% of their time searching for food. They are powerful swimmers and use sea ice as a platform for hunting, resting, reproducing, and traveling. While attacks on humans are rare, they can occur when bears are hungry, surprised, or protecting cubs.

How fast can a polar bear run?

Despite their size, polar bears can run at 25 mph (40 km/h) on land. They are not built for sustained speed, but they can cover ground quickly in short bursts.

25 cool facts about polar bears you need to know

1. Polar bears are the largest land carnivores on Earth.
2. Their scientific name is Ursus maritimus, meaning “maritime bear.”
3. Polar bear fur is transparent and hollow, not white. Their skin is black.
4. They can swim continuously for 60+ miles.
5. Males can weigh up to 1,760 lbs (800 kg).
6. Females are about half the size of males.
7. They primarily eat ringed and bearded seals.
8. Polar bears have an excellent sense of smell — they can detect a seal from nearly a mile away.
9. They live in five Arctic nations: Canada, Alaska, Greenland, Russia, and Norway.
10. Global population estimates range from 22,000 to 31,000 bears.
11. Polar bears are classified as Vulnerable on the IUCN Red List.
12. Climate change is their biggest threat due to sea-ice loss.
13. Pregnant females are the only ones that den over winter.
14. Adult polar bears have no natural predators besides humans.
15. They can run at 25 mph (40 km/h) on land.
16. Polar bears are considered marine mammals because they depend on the ocean.
17. They do not eat penguins — penguins live in the Antarctic.
18. Their diet is heavily dependent on fat-rich blubber.
19. Polar bears spend over 50% of their time hunting.
20. They can live 25–30 years in the wild.
21. Hybridization with grizzly bears has produced “pizzly bears.”
22. Polar bears have a longer neck and smaller ears compared to grizzlies.
23. They are solitary animals except during mating and cub-rearing.
24. Their sense of smell allows them to detect carrion from long distances.
25. Polar bears help regulate seal populations and act as sentinels for the Arctic ecosystem.

Polar bear conservation timeline: From unregulated hunting to climate crisis

1. 1973 — International Agreement on Conservation of Polar Bears signed by Arctic nations.
2. 1976 — First comprehensive population estimate: approximately 20,000 polar bears.
3. 2006 — IUCN Red List classifies polar bears as Vulnerable.
4. 2008 — U.S. lists polar bears as Threatened under the Endangered Species Act.
5. 2015 — Circumpolar Action Plan adopted to coordinate conservation across all range states.
6. 2023 — Global population estimates refined to 22,000–31,000 individuals.
7. 2025 — New studies link earlier sea-ice breakup to declining cub survival in some subpopulations.

Source: WWF, IUCN, Polar Bears International, USFWS.

What we know vs. what is still uncertain about polar bears

Established information	Information that remains unclear
Polar bears are the largest land carnivores on Earth.	Exact total population count — estimates range from 22,000 to 31,000.
They are classified as Vulnerable on the IUCN Red List.	How quickly polar bears can adapt to a sea-ice-free Arctic (e.g., terrestrial feeding).
Sea-ice loss due to climate change is the primary threat.	Whether the species will survive past 2100 under high-emission scenarios.
They primarily feed on ringed and bearded seals.	Frequency of hybridization with grizzly bears (“pizzly bears”) and long-term impacts.
They can swim long distances (documented >60 miles).	Long-term cub survival rates in rapidly changing subpopulations.

Analysis: Why polar bears matter beyond the Arctic

Polar bears are an umbrella species. Protecting them protects the entire Arctic ecosystem. As apex predators, they help regulate seal populations and act as a sentinel for climate change. Sea-ice conditions directly impact their survival, making them a visible indicator of broader environmental shifts.

There is also economic and cultural importance to Indigenous Arctic communities. Polar bears have been hunted for subsistence and have deep cultural significance for many northern peoples. Current research gaps remain in subpopulation monitoring, cub survival rates, and adaptation behavior as ice conditions continue to change.

Key sources and quotes on polar bears

“The largest bear in the world and the Arctic’s top predator, polar bears are a powerful symbol of the strength and endurance of the Arctic.”

— WWF

“The polar bear is the largest extant species of bear and land carnivore by body mass, with adult males weighing 300–800 kg (660–1,760 lb).”

— Wikipedia

“Polar bears are the largest bear in the world. They can grow up to 9 feet long, with males weighing between 800 to 1,300 pounds.”

— Marine Mammal Center

“Polar bears are found in the frozen wilds of the Arctic, in Canada, Alaska (US), Greenland, Russia and Norway.”

— NatGeo Kids

The future of polar bears: What to watch for in 2025 and beyond

A new IUCN assessment is expected in late 2025, which may revise the conservation status. Continued monitoring of subpopulation trends in Hudson Bay and the Southern Beaufort Sea will be critical. Technological advances such as satellite collars and drone surveys are improving population counts. Policy focus will remain on Arctic shipping, oil and gas development, and sea-ice conservation. For further context on generational perspectives and data analysis, you can explore the Millennials Generation – Age Range, Birth Years and Key Traits and the Difference Between – Meaning, Grammar, and Percent Difference guides for more informational content.

Frequently asked questions about polar bears

What is the scientific name for a polar bear?

The scientific name is Ursus maritimus, meaning “maritime bear” in Latin.

How long do polar bears live?

In the wild, polar bears typically live 25–30 years. In captivity, they can live up to 40 years.

Are polar bears actually white?

No. Polar bear fur is transparent and hollow, which scatters visible light and makes them appear white or cream-colored. Their skin is actually black.

How far can a polar bear swim?

Polar bears have been recorded swimming continuously for over 60 miles (96 km) and can swim for days at a time.

Why are polar bears important to the Arctic ecosystem?

As apex predators, polar bears help regulate seal populations and are a key indicator of the health of the Arctic marine ecosystem. Protecting them also protects the entire habitat.

What is the difference between a polar bear and a grizzly bear?

Polar bears are larger (800–1,300 lbs vs. 400–790 lbs for grizzlies), have longer necks, smaller ears, and white fur adapted for Arctic conditions. Grizzlies have brown fur, a shoulder hump, and are more omnivorous.

Are polar bears dangerous to humans?

Yes, polar bears are powerful predators and can be dangerous. Attacks are rare but can occur when bears are hungry, surprised, or protecting cubs.

How fast can a polar bear run?

Polar bears can run at 25 mph (40 km/h) on land in short bursts.

Do polar bears hibernate?

Only pregnant female polar bears den over winter. Males and non-pregnant females remain active year-round.

What is the largest polar bear ever recorded?

The largest recorded polar bear weighed approximately 2,209 lbs (1,002 kg) and stood 11 ft 1 in (3.39 m) tall. This was a male shot in 1960 in Kotzebue Sound, Alaska.