Squirrels are perfectly equipped for their cleaning role because they naturally love to run along the wires as they move from tree to tree. This means they have no problems in gaining access to parts of the cables that humans could only reach using ladders. Squirrels also have big bushy tails, which they can drag along the wires behind them as they run. These tails are perfectly designed for sweeping dirt off the cables and ensuring that the wires are always in pristine condition.