The polar bear (Ursus maritimus) is the world's largest land carnivore, native to the Arctic sea ice across five countries: Canada, the United States (Alaska), Russia, Norway (Svalbard), and Greenland (Denmark). Adults are highly specialized for life on sea ice, with water-repellent fur, partially webbed feet, and a metabolism that can shift dramatically depending on food availability. They are classified as Vulnerable on the IUCN Red List, with the global population estimated at 20,000 to 31,000 individuals as of the most recent IUCN assessment.
Polar bears sit at the top of the Arctic marine food web, feeding primarily on ringed seals (Pusa hispida) and bearded seals (Erignathus barbatus), which they hunt from the surface of sea ice. The accelerating loss of Arctic sea ice driven by climate change is the single greatest long-term threat to the species, reducing the time bears can spend hunting and forcing longer fasting periods on land. Secondary pressures include industrial development in the Arctic, shipping traffic through previously frozen routes, and the bioaccumulation of persistent organic pollutants, which concentrate in the fat that bears depend on for survival.
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