If you compiled a list of dangerous animals likely to damage your windows then squrrels may not be at the top.
We have had a stained glass window and wooden frame brought to us recently with extensive damage. the reason? Squrrel attack!!
The little furry critter came down the chimney of the house and couldn’t get out again. So it tried to chew its way out of the window, damaging the window frame, the lead and glass of the stained glass.
This story has a happy ending. When the resident came home they were supprised to see a squrrel running out of the front door when they opened it and rather alarmed to find the condition of their window.