Polar Bear


  • Status
  • Population
  • Scientific Name
    Ursus maritimus
  • Weight
    800–1,300 pounds (males), 300-700 (females)
  • Length
    6–9 feet
  • Habitats
    Arctic Ocean, sea ice, and adjacent coastal areas
Polar Bear Population Update Map 2019

Click here to view larger map image

Polar_Bear_Populations4_1.1... This map shows the 19 subpopulations of polar bears across the Arctic.

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. The polar bear's Latin name, Ursus maritimus, means "sea bear." It's an apt name for this majestic species, which spends much of its life in, around, or on the ocean–predominantly on the sea ice. In the United States, Alaska is home to two polar bear subpopulations.

Considered talented swimmers, polar bears can sustain a pace of six miles per hour by paddling with their front paws and holding their hind legs flat like a rudder. They have a thick layer of body fat and a water-repellent coat that insulates them from the cold air and water.

Polar bears spend over 50% of their time hunting for food. A polar bear might catch only one or two out of 10 seals it hunts, depending on the time of year and other variables. Their diet mainly consists of ringed and bearded seals because they need large amounts of fat to survive.

Polar bears rely heavily on sea ice for traveling, hunting, resting, mating and, in some areas, maternal dens. But because of ongoing and potential loss of their sea ice habitat resulting from climate change–the primary threat to polar bears Arctic-wide–polar bears were listed as a threatened species in the US under the Endangered Species Act in May 2008. As their sea ice habitat recedes earlier in the spring and forms later in the fall, polar bears are increasingly spending longer periods on land, where they are often attracted to areas where humans live.

The survival and the protection of the polar bear habitat are urgent issues for WWF. In October 2019, the International Union for the Conservation of Nature (IUCN) Polar Bear Specialist Group released a new assessment of polar bear populations showing that the number of polar bear subpopulations experience recent declines has increased to four, with eight populations still being data-deficient. The good news is that five populations are stable while two have been experiencing an upward trend.

Fun Facts:
  • 40kph: The polar bear's top speed
  • 42 razor sharp teeth: With jagged back teeth and canines larger than grizzly teeth, they pack quite the bite
  • 30 cm wide paws: The size of a dinner plate! A natural snowshoe that helps the bear trek across treacherous ice and deep snow
  • 3 eyelids: The third helps protect the bear's eyes from the elements
  • 4 inches of fat: Under the bear's skin to keep it warm
  • Black skin
  • Transparent fur
  • Blue tongue

Secrets in the snow

In a landmark study published in Frontiers in Conservation Science, WWF, and collaborators have unveiled an innovative method for extracting DNA from the snow tracks of three elusive carnivores, including polar bears. The new technique involves retrieving trace amounts of environmental DNA—known as eDNA—shed from the footpads of these animals in the snow, enabling the identification of individual animals.

A close view of a polar bear paw print in the snow

Why They Matter

  • Importance of polar bears

    Polar bears are at the top of the food chain and have an important role in the overall health of the marine environment. Over thousands of years, polar bears have also been an important part of the cultures and economies of Arctic peoples.

  • Today, polar bears are among the few large carnivores that are still found in roughly their original habitat and range–and in some places, in roughly their natural numbers.

  • Polar bears are an integral part of the Arctic ecosystem and the food web for Indigenous peoples who have hunted polar bears sustainably for millennia. But beginning in the 1700s, large-scale hunting by European, Russian and North American hunters and trappers took place, raising concerns about the future survival of polar bears.

  • Although most of the world's 19 populations have returned to healthy numbers, there are differences between them. Some are stable, some seem to be increasing, and some are decreasing due to various pressures

  • Polar bears depend on sea ice for their existence and are directly impacted by climate change–serving as an important indicator species. By 2040, scientists predict that only a fringe of ice will remain in Northeast Canada and Northern Greenland when all other large areas of summer ice are gone. This "Last Ice Area" is likely to become important for polar bears and other life that depends on ice.

  • A projection of sea ice in the archipelago, supported by WWF, shows that much of the region is facing significant ice loss in the coming decades–with potentially serious consequences for polar bears. Global polar bear numbers are projected to decline by 30% by 2050. This needs to be addressed immediately if polar bears and other species unique to the region are to survive.


  • Population 22,000-31,000
  • Extinction Risk Vulnerable
    1. EX

      No reasonable doubt that the last individual has died

    2. EW
      Extinct in the Wild

      Known only to survive in cultivation, in captivity or as a naturalised population

    3. CR
      Critically Endangered

      Facing an extremely high risk of extinction in the Wild

    4. EN

      Facing a high risk of extinction in the Wild

    5. VU

      Facing a high risk of extinction in the Wild

    6. NT
      Near Threatened

      Likely to qualify for a threatened category in the near future

    7. LC
      Least Concern

      Does not qualify for Critically Endangered, Endangered, Vulnerable, or Near Threatened

Polar bear (Ursus maritimus) mother and two cubs standing on fractured ice floe. Svalbard, Norway.

The loss of sea ice habitat from climate change is the biggest threat to the survival of polar bears. Other concerns for polar bears include lethal response to human-polar bear conflict, toxic pollution in the environment, and direct impacts from industrial development, such as disturbance of maternal dens or contact with an oil spill, and potential overhunting of some subpopulations.

Polar bear- Human Conflicts

As Arctic sea ice thins and retreats, increasing numbers of polar bears are spending longer periods in the summer open-water season along Arctic coastlines. Here, their powerful sense of smell attracts them to human communities: garbage, stored food, dog teams, and animal carcasses bring them into greater conflict with Arctic people.

As powerful predators, polar bears pose a major risk to human life and property. Throughout the polar bear's range, attacks on humans and property continue to rise. In recent years, more than 20 direct attacks on humans have been reported within the polar bear's range.

WWF is supporting community initiatives to ensure they can live safely alongside the Arctic's top predator.

Effects of Climate Change

Due to climate change the Arctic is heating up twice as fast as anywhere else on the planet, shrinking the Arctic sea ice cover by 14% per decade. Compared to the median sea ice cover recorded between 1981-2010, we have lost about 770,000 square miles, an area larger than Alaska and California combined.

  • Fewer opportunities to feed
    Polar bears rely on sea ice to hunt seals, rest, breed, and store energy for the summer and autumn, when food can be scarce. Sea ice now melts earlier in the spring and forms later in the autumn in the bears' southern range, like Hudson Bay and James Bay in Canada. As the bears spend longer periods without food, their health declines. For every week earlier that the ice breaks up in Hudson Bay, bears come ashore roughly 22 pounds lighter and in poorer condition. In the US, polar bears have experienced significant changes to seasonal variability and availability of sea ice habitat. For example, polar bears in the southern Beaufort Sea have recently experienced about twice as many reduced ice days over continental shelf waters than polar bears in the Chukchi and Bering Seas nearby. As a result, polar bears studied in the Chukchi and Bering Seas were larger, in better condition, and had higher reproduction rates likely since they had more access to food and did not have to fast for as long in the spring as those living in the southern Beaufort Sea. Bears must move longer distances to stay with the rapidly receding ice. In most areas, they come ashore when ice melts and rely on fat stores until the ice refreezes so they can go back out to hunt. Traditional prey species may be less accessible in a new sea ice environment, and seals that use the ice are predicted to fare poorly in the warming Arctic region.

  • Fewer cubs
    Some polar bears may suffer from malnutrition. In extreme cases they may face starvation–especially females with cubs. Unhealthy bears can lead to lower reproduction rates and extinction in certain locations. Scientists have found the main cause of death for cubs to be either lack of food or lack of fat on nursing mothers

  • Habitat fragmentation
    Climate change is also resulting in more habitat fragmentation. As Arctic ice melts, polar bears are affected by increased shipping activities and a rise in opportunities for oil and gas development, that WWF is currently fighting against.

Industrial impacts

In the Arctic, most industrial development has been on relatively small pieces of land. As summer sea ice retreats, a new ocean is emerging, which allows more opportunities for industrial development at sea and on larger parcels of land, which WWF is currently fighting against.

At the same time, the retreating ice is resulting in more polar bears spending longer periods on land.

Offshore petroleum installations and operations in the Arctic are expected to increase in number. This expansion would likely affect polar bears and their habitat in many ways, including the following:

  • Reducing the insulation of polar bear fur from spilled oil.
  • Poisoning from ingesting oil and eating contaminated prey.
  • Disturbance.
  • Destruction of habitat.
  • Impacts on entire food webs.
  • Oil spreading to areas outside of the Arctic

Increased Arctic shipping represents a risk to polar bears. As traffic by barges, oil tankers, and cargo ships in Arctic waters increases, so do the risk of oil spills and human disturbance to polar bears.

What WWF Is Doing

Polar bear (Ursus maritimus) female with a single young cub, only a few months old, northern Svalbard, Norway, June

Addressing climate change

WWF has a dedicated worldwide team working on issues of climate and energy, working regionally, nationally, and internationally.

  • We support research on climate change effects, and show the way forward by funding research and analysis on alternative energy.
  • We advocate for governments to recognize and mitigate the effects of climate change on polar bears.
  • WWF has successfully pushed for a statement by countries with polar bear populations, formally recognizing the urgent need for an effective global response to address the challenges of climate change.
  • WWF has successfully advocated for the creation of a circumpolar polar bear management plan.

At meetings with governments whose countries are in the polar bear range, WWF has successfully pushed for a statement formally recognizing the urgent need for an effective global response that will address the challenges of climate change. WWF has also successfully advocated for the creation of an international polar bear management plan.

Reducing conflict

As climate change forces polar bears to spend longer time onshore, they come in contact more often with Arctic communities. Unfortunately, these interactions sometimes end badly for humans and bears. In Russia, Alaska, Greenland, and Canada, WWF addresses this challenge by supporting local efforts to protect people and polar bears. Watch this video to learn more about the benefits of involving local people to protect polar bears and communities.

Keeping polar bears separate from people is better for both, since polar bears that wander into communities pose a risk to people, and people often respond by killing the bears. WWF has responded with a variety of locally-led initiatives to help reduce conflict.

  • We've supported the design of steel food storage containers, so that local people can continue to store their food outside but protect it from marauding bears and electric fences to separate bears from dog teams.
  • WWF is supporting polar bear patrols to deter bears before they get into communities.
  • Throughout the Arctic, we convene workshops for people to share their experiences and successes in keeping the peace between people and bears.

Monitoring populations

To implement the effective polar bear conservation interventions, we have to know more about them.

In addition to supporting current work by scientists to monitor the conditions and movement of polar bears to understand the impact that different threats, such as climate change and the expansion of industry in the Arctic, are having on different polar bear populations, WWF and our partners are working to catalyze development of new technology that will make polar bear research more cost effective, less invasive, and deliver more useful data. For example:

(Polar B)ear Tags:

A few years ago, WWF began working with IDEO, Misty West, US Fish and Wildlife Service, and other partners to rethink polar bear ear tags.

Valuing Knowledge

Knowledge comes from many places. In the Arctic, we speak of our work as being "knowledge-based" rather than solely "science-based." Indigenous peoples of the Arctic have a store of ecological knowledge based on their own observations of the environment and on information handed down over generations.

WWF encourages the use of Traditional Ecological Knowledge (TEK) to inform management policies in the Arctic. We have supported several projects that collect this form of knowledge, helping to provide a more rounded knowledge base. WWF has also supported research on TEK in the US and Canada, which provides invaluable information for conservation and management of the species.

Reducing industrial impacts

WWF's goal is to ensure that wherever industrial development takes place, it is sustainable and does not damage wildlife populations and ecosystems to any great extent. We offer technical expertise on oil spill prevention and response. We also advocate for the highest development standards through national and international venues.

WWF collaborates with scientists, conservationists, and local people to oppose oil and gas development in areas whose ecological value is far too great for risking exposure to spills.

Addressing Impacts of Increased Shipping in the Bering Strait

The 58-mile-wide Bering Strait is one of the Arctic’s most biologically productive environments and a vital migratory corridor. The decline of summer sea ice has dramatically changed the face of global commerce and trade in the Arctic and the increase in industrialization and shipping traffic has the potential to significantly impact the Bering Strait and its inhabitants. To address these increasing threats, WWF US, along with other academic and NGO partners, recently published Recommended Shipping Measures for the Bering Strait Region which includes five recommendations to ensure the future safety of this globally significant marine habitat:

1) Expand implementation of e-navigation and technology
2) Adopt modern Sea Traffic Management measures
3) Establish an Area to Be Avoided surrounding the Diomede Islands
4) Develop region-specific industry practices to minimize adverse impacts and risks
5) Strengthen domestic and bilateral emergency prevention and response capabilities

These measures must be based on identified Indigenous marine use in the Bering Strait. Now is the opportunity to protect this new maritime frontier before it is too late. Bilateral cooperation will be essential for the success of these recommendations.

To help maritime vessels stay clear of ecologically fragile places, WWF is preparing sensitivity maps for areas of the Arctic. We have also offered best practices for shipping in the Arctic and continue to work at the International Maritime Organization on a polar code that would make Arctic shipping safer.

Protecting Critical Habitat

WWF recognizes the urgency of protecting habitat for polar bears as they rapidly lose their sea ice habitat from climate change.

  • We support the identification and protection of important polar bear habitat (denning areas and movement corridors, seasonal feeding areas/times, and key resting areas during the ice free period).
  • We are supporting research to identify high value habitat areas—areas where the bears feed, den, and give birth— and work with partners to conserve these places.

Ensuring Sustainable Hunting

WWF supports the right of Indigenous peoples to continue to sustainably hunt local animals.

Protecting Important Polar Bear Denning Habitat

Terrestrial and marine denning habitats for polar bears are increasingly disappearing and under threat from climate change and human and industrial influence. Sea ice is essential for polar bears and, in addition to hunting, resting, and finding mates, many polar bears have historically used sea ice as a platform for their maternal dens. But, climate change is melting and fragmenting sea ice across the Arctic, forcing more pregnant females to make their dens on land instead. In addition, new oil and gas exploration and drilling threaten vulnerable polar bear populations. These activities not only compound the climate crisis but can disturb or even crush polar bears in their dens. WWF is working to ensure that places like the Arctic National Wildlife Refuge are protected for securing the survival of America’s polar bears.

Timeline of polar bear conservation

  • Before 1972

    Polar bears are an integral part of the Arctic ecosystem and the food web for Indigenous peoples who have hunted polar bears sustainably for millennia. But beginning in the 1700s, large-scale hunting by European, Russian and North American hunters and trappers took place, raising concerns about the future survival of polar bears.

  • 1972

    The Marine Mammal Protection Act (MMPA) was signed, and included polar bears as one of many species protected under the new legislation.

  • 1973

    Canada, the United States, Denmark, Norway and the former USSR signed the International Agreement on the Conservation of Polar Bears and their Habitat, strictly regulating commercial hunting.

  • 2005

    The polar bear was upgraded from Least Concern to Vulnerable by the IUCN Polar Bear Specialist Group.

  • 2008

    The US Government classified the Polar Bear under its Endangered Species Act (ESA).

  • 2013

    Ministers and other leaders from the five polar bear range states met in Moscow for the first International Forum on Polar Bear Conservation. The leaders made significant commitments to address issues of polar bear habitat, research and trade. This event was supported by WWF.

  • Today

    Today, polar bears are among the few large carnivores that are still found in roughly their original habitat and range--and in some places, in roughly their natural numbers.

    Although most of the world's 19 populations have returned to healthy numbers, there are differences between them. Some are stable, some seem to be increasing, and some are decreasing due to various pressures.

    Status of the polar bear populations
    Updated 2019 with data from the IUCN Polar Bear Specialists Group

    • 4 populations are in decline
    • 2 populations are increasing
    • 5 populations are stable
    • 8 populations are data-deficient (information missing or outdated)
  • In the future

    By 2040, scientists predict that only a fringe of ice will remain in Northeast Canada and Northern Greenland when all other large areas of summer ice are gone. This "Last Ice Area" is likely to become important for polar bears and other life that depends on ice.

Nature Breaking Polar Bears and Environmental DNA

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