They are the most destructive little creatures we have. The amount of damage they can do is unbelievable. I declared war on them years ago after they chewed the tops off of all the flowers in our newly planted flower boxes and destroyed wool shirts that were hung out to air. Since that day I've shot hundreds here on the property. The ravens, magpies and Bald Eagles seem appreciative of the free meals.
Ask any telco lineman or repair man about the damage they do to outside plant (aka cable)