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The polar bear (Ursus maritimus) is a large mammal of the order Carnivora, family Ursidae. It is a circumpolar species found in and around the Arctic Ocean. It is the world's largest land carnivore. Adult males weigh from 400 to 600 kilograms and occasionally exceed 800 kilograms. Females are about half the size of males and normally weigh 200 to 300 kilograms. Adult males measure 240 to 260 centimeters and females 190 to 210 centimeters. At birth, cubs weigh 600 to 700 grams.

The polar bear is instantly recognisable by its white coat. Unlike other arctic mammals it never sheds this coat for a darker colour in summer. The hair is not actually pigmented white; it is unpigmented and hollow, like white hair in humanHuman beings are defined variously in biological, spiritual, and cultural terms, or in combinations thereof. Biologically, they are classified as Homo sapiens ( Latin for knowing man , a primate species of mammal with a highly developed brain. In spirituas.

Two polar bears sparring near Churchill, ManitobaChurchill, Manitoba is a town on the shore of Hudson Bay in Manitoba, Canada. It is most famous for the many polar bears that come ashore in the winter, looking for easily available food. Its status as "polar bear capital of the world" has turned it into, CanadaCanada historically the Dominion of Canada is the second-largest, and northernmost, country in the world. It is a decentralized federation of 10 provinces and 3 territories, governed as a constitutional monarchy, and formed in 1867 through an act of Confe.

Polar bears are wonderfully insulated; to the point where they overheat at temperatures above 50°F (10°C). Their insulation is so effective that when viewed with infrared (heat) camera they are barely visible. Only the pads of their feet emit detectable heat.

It is the most completely carnivorous member of the bearFor other meanings, see Bear (disambiguation). Ailuropoda Ursus Tremarctos Arctodus A bear is a large mammal of the order Carnivora, family Ursidae . The adjective, ursine is used to describe things of bearlike nature. Physical attributes Common character family and feeds mainly on seals. Polar bears are superb swimmers and can often be seen in open waters miles from land. This may be a sign that they have begun aquatic adaptations to better catch their prey. They also hunt very efficiently on land due to their prodigious speed; they are more than capable of outrunning a man. As a pure carnivore predating upon fish-eating carnivores, the polar bear ingests large amounts of vitamin A, which ends up stored in its liver: in the past, arctic explorers have been poisoned by eating Polar Bear liver.

Three polar bears investigate the submarine USS Honolulu near the North Pole.

Polar bears are currently threatened, not mainly by hunting, but by habitat loss caused by global warming; for example, the area of ice covering Hudson Bay in Northern Canada in winter is shrinking, limiting their access to seal prey. The sensitivity of the survival rates of the bears to global temperature is attested to by the population bulge in the cohort of bears born during the transient cooling that followed the eruption of Mount Pinatubo in 1991.

An interesting feature of the coat is that it appears black when photographed with ultraviolet light. A number of people have suggested that this is because the hairs channel the light to the black skin of the bear to help it stay warm during the cold, sunless winters. Measurements show, however, that the hairs strongly absorb violet and ultraviolet rays. This is why polar bear's pelt often appears yellow. More colourful polar bear have occasionally been reported. In February 2004, two polar bears in a Singapore zoo appeared to turn green as a result of algae growing in their hollow hair tubes. A zoo spokesman said that the algae had formed as a result of Singapore's hot and humid conditions. The bears were washed in a peroxide blonde solution to restore their expected colour. A similar algae grew in the hair of three polar bears at San Diego Zoo in the summer of 1979. They were cured by washing the algae away in a salt solution.

A polar bear is depicted on Canada's $2 toonie coin.

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PolarisPolaris Alpha Ursae Minoris, is the bright star closest to the north celestial pole, making it the current north pole star. It is also known as the North Star the Lode Star or the Pole star . Because it lies nearly in a direct line with the axis of the Ea Polar BearThe polar bear Ursus maritimus is a large mammal of the order Carnivora, family Ursidae. It is a circumpolar species found in and around the Arctic Ocean. It is the world's largest land carnivore. Adult males weigh from 400 to 600 kilograms and occasional Polarential telegraph systemA polarential telegraph system is a direct-current telegraph system employing polar transmission in one direction and a form of differential duplex transmission in the other. Two types of polarential systems, known as types A and B, are in use. In half-du PolarizationThis article treats polarization in electrodynamics. Other articles treat polarization in electrostatics, polarization in politics and polarization in psychology. In electrodynamics, polarization is a property of waves, such as light and other electromagn Polarization-maintaining optical fiberIn telecommunication, a polarization-maintaining optical fiber (PM) is an optical fiber in which the polarization planes of lightwaves launched into the fiber are maintained during propagation with little or no cross-coupling of optical power between the Polar auroraPolar aurorae are optical phenomena characterized by colorful displays of light in the night sky. An auroral display in the Northern Hemisphere is called the aurora borealis or the northern lights in the Southern Hemisphere it is called the aurora austral Polar climate Polari Polar Satellite Launch Vehicle Polar Air Cargo Polar, Wisconsin Polaroid Polaroid Corporation Polar circle Polar distance