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

Animals

The squirrel's tail has many uses; it can be used as blanket, a parachute, a way to balance and a way to communicate. By flicking their tail toward another animal they are saying "Go away!"

Animals

The arctic fox has the best insulating fur of all mammals.

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