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Hibernating bears reduce their metabolism by 75% during hibernation. Amazingly their body temperature is only reduced by 10 degrees Fahrenheit (4 Celsius).

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The mosquito is the most dangerous animal in the world, accounting for one to two million fatalities each year. By comparison, bears only cause five to fen fatalities per year.

The arctic ground squirrel hibernates at 26 degrees Fahrenheit (-3 Celsius), the lowest temperature ever recorded in any live mammal. Despite the frigid temperature, it's blood continues to flow without freezing.

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When Polar Bear cubs are born they weigh only about a pound and half (600 grams). They can eventually grow to an astonishing 2000 lbs (907 kg).

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