You don't know squirrels then.
I have 2 pecan trees and you would think that would keep them happy, but no. Christmas is the worst. They chew on the light strings. I had one completely eat the bulb & socket off a string a couple of years ago. They are notorious here for shorting across the power switches and transformers causing blackouts. They chew on the wires and expose them to leaking from water and such.