, Modern methods of tracking polar bear populations have been implemented only since the mid-1980s, and are expensive to perform consistently over a large area. While the algae is harmless to the bears, it is often a worry to the zoos housing them, and affected animals are sometimes washed in a salt solution, or mild. It grows to about 1.6 metres (5.3 feet) tall at the shoulder and 2.2–2.5 metres in length.  Most terrestrial animals in the Arctic can outrun the polar bear on land as polar bears overheat quickly, and most marine animals the bear encounters can outswim it.
 Environment Canada also banned the export from Canada of fur, claws, skulls and other products from polar bears harvested in Baffin Bay as of 1 January 2010.
Given the change in climate, with ice breaking up in areas such as the Hudson Bay earlier than it used to, polar bears are exploiting food resources such as snow geese and eggs, and plants such as lyme grass in increased quantities.  This decision was approved of by members of the IUCN and TRAFFIC, who determined that such an uplisting was unlikely to confer a conservation benefit.
, The polar bear is found in the Arctic Circle and adjacent land masses as far south as Newfoundland.
, Mature bears tend to eat only the calorie-rich skin and blubber of the seal, which are highly digestible, whereas younger bears consume the protein-rich red meat.
The whales are of similar size to the walrus and nearly as difficult for the bear to subdue. , Due to warming air temperatures, ice-floe breakup in western Hudson Bay is currently occurring three weeks earlier than it did 30 years ago, reducing the duration of the polar bear feeding season.
 The mtDNA of extinct Irish brown bears is particularly close to polar bears. Polar bear. The Soviet Union banned all hunting in 1956.
Polar bears injured in fights or accidents may either die from their injuries, or become unable to hunt effectively, leading to starvation.
Fur even grows on the bottom of their paws, which protects against cold surfaces and provides a good grip on ice.
, In addition to creating nutritional stress, a warming climate is expected to affect various other aspects of polar bear life: Changes in sea ice affect the ability of pregnant females to build suitable maternity dens. They were also diving to feed on blue mussels and other underwater food sources like the green sea urchin.  This may cause an increased reliance on terrestrial diets, such as goose eggs, waterfowl and caribou, as well as increased human–bear conflict. Rising temperatures cause the sea ice to melt earlier in the year, driving the bears to shore before they have built sufficient fat reserves to survive the period of scarce food in the late summer and early fall. Third, the recent effects of climate change have affected sea ice abundance in different areas to varying degrees. , The polar bear is the apex predator within its range, and is a keystone species for the Arctic. , When the ice floes are at their minimum in the fall, ending the possibility of hunting, each pregnant female digs a maternity den consisting of a narrow entrance tunnel leading to one to three chambers. Most brown bears have about 2 percent genetic material from polar bears, but one population, the ABC Islands bears, has between 5 percent and 10 percent polar bear genes, indicating more frequent and recent mating. Polar bears hunt seals from a platform of sea ice.
They are about seven to eight feet long, measured from the nose to the tip of their very short tail.
These were traded in the villages of the lower Yenisei and Khatanga rivers to the forest-dwelling peoples further south, who would sew them into their hats as protection against brown bears.  The Yupik also refer to the bear as nanuuk in Siberian Yupik. If the opportunity presents itself, polar bears will also consume carcasses, such as those of dead whales. " Cubs are especially playful as well.
These legends reveal a deep respect for the polar bear, which is portrayed as both spiritually powerful and closely akin to humans. While not unheard of but still uncommon, polar bears have been sighted increasingly in larger numbers ashore, staying on the mainland for longer periods of time during the summer months, particularly in North Canada, traveling farther inland.  However, since polar bear fur has always played a marginal commercial role, data on the historical harvest is fragmentary. Most maternity dens are in snowdrifts, but may also be made underground in permafrost if it is not sufficiently cold yet for snow.
 A rather unlikely killer of a grown polar bear has reportedly included a wolverine (Gulo gulo), anecedotely reported to have suffocated a bear in a zoo with a bite to the throat during a conflict. Polar bears roam the Arctic ice sheets and swim in that region's coastal waters. It is difficult to estimate a global population of polar bears as much of the range has been poorly studied; however, biologists use a working estimate of about 20–25,000 or 22–31,000 polar bears worldwide.  The evolutionary pressure of polar bear predation on seals probably accounts for some significant differences between Arctic and Antarctic seals.  The growth of the human population in the Eurasian Arctic in the 16th and 17th century, together with the advent of firearms and increasing trade, dramatically increased the harvest of polar bears.  On average, each litter has two cubs.  Traditional subsistence hunting was on a small enough scale to not significantly affect polar bear populations, mostly because of the sparseness of the human population in polar bear habitat.
The bearded seal, on the other hand, can be nearly the same size as the bear itself, averaging 270 kg (600 lb). For the We Bare Bears character, see, Coat of arms of the Greenlandic Self-Rule government (, Conservation status, threats, and controversies. The polar bear kills the seal by biting its head to crush its skull.
One important adaptation of polar bears to their unique climate is the transparency of their thick fur, which allows sunlight to pass through and reach their black skin, where heat from the sun is then absorbed. The shoulder height of an adult polar bear is 122 to 160 cm (4 ft 0 in to 5 ft 3 in). According to the IUCN Red List of Threatened Species, the category of vulnerable, as distinct from the category of endangered, means that polar bears have a slightly lower risk of extinction than if they were endangered.  Freshwater is limited in these environments because it is either locked up in snow or saline. , Between November and February, cubs are born blind, covered with a light down fur, and weighing less than 0.9 kg (2.0 lb), but in captivity they might be delivered in the earlier months.
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