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The American red squirrel is the most common squirrel in the United States.
They like to chew the wires.
The Declaration • January 29, 2019 • https://thedeclarationatcoloniahigh.com/36893/fun-factofthe-day/10-20-of-us-power-outages-are-caused-by-squirrels/
10-20% of US power outages are caused by squirrels.