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The polar bear (Ursus maritimus) is a large bear native to the Arctic and nearby areas. It is closely related to the brown bear, and the two species can interbreed.The polar bear is the largest extant species of bear and land carnivore, with adult males weighing 300–800 kg (660–1,760 lb).
The key danger for polar bears posed by the effects of climate change is malnutrition or starvation due to habitat loss.Polar bears hunt seals from a platform of sea ice. 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.
At the top of the food chain are the bears. Alaska contains about 70% of the total North American brown bear population and the majority of the grizzly bears, as well as black bears and Kodiak bears. In winter, polar bears can be found in the Kuskokwim Delta, St. Matthew Island, and at the southernmost portion of St. Lawrence Island.
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International Polar Bear Day is organized by Polar Bears International to raise awareness about the impact of global warming and reduced sea ice on polar bear populations. [3] The day encourages people to find ways to reduce their carbon output, such as by turning down their thermostat or driving less. [ 4 ]
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Gus (1985–August 27, 2013) was a 700-pound (320 kg) [1] [2] polar bear and icon of the Central Park Zoo in New York City. [3] His exhibit was visited by over 20 million people during his lifetime. [3] [4] He came to public notice in the 1990s, when he began swimming obsessively in his pool for up to 12 hours a day.
Ursus is a genus in the family Ursidae that includes the widely distributed brown bear, [3] the polar bear, [4] the American black bear, and the Asian black bear. The name is derived from the Latin ursus , meaning bear .