Polar Bear

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polar bear : a large creamy-white carnivorous bear (Ursus maritimus synonym Thalarctos maritimus) that inhabits arctic regions — Webster

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Polar bear (Ursus maritimus) is a hypercarnivorous bear whose native range lies largely within the Arctic Circle, encompassing the Arctic Ocean, its surrounding seas and surrounding land masses. It is a large bear, approximately the same size as the omnivorous Kodiak bear (Ursus arctos middendorffi). A boar (adult male) weighs around 350–700 kg (772–1,543 lb), while a sow (adult female) is about half that size. Although it is the sister species of the brown bear, it has evolved to occupy a narrower ecological niche, with many body characteristics adapted for cold temperatures, for moving across snow, ice and open water, and for hunting seals, which make up most of its diet. Although most polar bears are born on land, they spend most of their time on the sea ice. Their scientific name means “maritime bear” and derives from this fact. Polar bears hunt their preferred food of seals from the edge of sea ice, often living off fat reserves when no sea ice is present. Because of their dependence on the sea ice, polar bears are classified as marine mammals — Wikipedia

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Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • Solitonics in molecular wires could benefit...
    on March 24, 2020 at 1:20 pm

    Soliton descriptions for the conducting polymers polyacetylene—descriptions based around a type of solitary wave—caused great excitement when they first broke in the seminal reports by Su, Schrieffer, Heeger (SSH) and Kivelson over 30 years ago. As some of the simplest topological insulators, these molecules are now attracting revived interest. However, problems synthesizing single polyacetylene molecules had limited these soliton studies to extrapolations of soliton characteristics […]

  • Polar bear den detection methods work less than...
    on March 13, 2020 at 12:00 pm

    When fuel companies explore northern Alaska for oil, federal regulations require them to steer clear of polar bears. To locate the endangered species during winter months, fixed-wing planes mounted with forward-looking infrared technology, or FLIR, are sent out to scan for dens hidden under the ice.

  • Water-free way to make MXenes could mean new uses...
    on March 13, 2020 at 8:19 am

    Ten years after producing the first sample of the now widely studied family of nanomaterials, called MXenes, Drexel University researchers have discovered a different way to make the atom-thin material that presents a number of new opportunities for using it. The new discovery removes water from the MXene-making process, which means the materials can be used in applications in which water is a contaminant or hampers performance, such as battery electrodes and next-generation solar cells.

  • Image: Canadian Arctic Archipelago
    on March 6, 2020 at 2:10 pm

    The Copernicus Sentinel-3 mission takes us over part of the Canadian Arctic Archipelago. Most of the archipelago is part of Nunavut—the largest and northernmost territory of Canada.

  • Climate change threatens relationship between...
    on February 28, 2020 at 1:47 pm

    The iconic relationship between polar bears and ringed seals is changing in western Hudson Bay, and even though the bears are eating fewer ringed seals, the seals should refrain from celebrating.