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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!"
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.