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The Polar Bear is the only bear classified as a marine mammal due to it's reliance on sea ice habitat. It's a common misconception that polar bears can move onto land and live like other bears once sea ice disappears. Here is a great source of more interesting facts on Polar Bears.

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from Live Science

Lasers Could Help Protect Polar-Bear Dens from Oil Drilling

What do you call a polar bear? Threatened? Endangered? Or overhyped and overprotected? It all depends on where you're standing.

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from Live Science

Polar Bear Facts

A new study suggests polar bears aren't harmed when they are tranquillized and handled by researchers. The matter is controversial in the North, where many Inuit believe that research injures the bears, leaves chemical residue in their bodies and shows …

from Live Science

Dawn of Polar Bears Far Earlier Than Thought

A large male polar bear returns to feed on a fin whale carcass. On land, where bears cannot hunt for seals, food is scarce and polar bears mainly depend on washed up marine mammals for food. Holmiabukta Bay, Northwestern Svalbard, Norway.

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from Live Science

Polar Bear Facts

A female polar bear typically gives birth to twins, though singles and triplets have been recorded. At birth, a cub weighs only 1.3 pounds (about half a kilogram), but they grow very quickly. Cubs depend on their mothers for warmth and fattening milk, which is 36 percent fat, according to the San Diego Zoo. By spring, the cubs are outside the den, exploring, and at two years of age they are fully mature. Polar bears live around 15 to 20 years.