Polar bears live in the Arctic Tundra, specifically in countries like Canada.

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  Polar bear are the world laregest road predator. Adult males weigh between 300 to 800 kilograms, but females weigh between 150 to 300 kilograms. Whatever, they are also the most canicorous species, eating 98.5 percent of their diet meat, most of them are seals like what I'm saying at the page diet. Altough they can eat, they can also swim! Most of the polar bears can swim often times for days at a time. They are extremly strong swimmers that can swim for alots of days with out like one second rest. 

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  Finally, the dangerous that the artic tundra face is the climate change, that means the whole universe is become warmer; That will cause those ice melting alots, If the tempreture is not enough, they will all die.