I have just moved into a new home (cedar) that has squirrels living in the walls. I think I can see were they are going in and was thinking of using some kind of steel screen to block them out but would love to know that I'm not trapping babies inside to rot and stink. I would also like to know if they might have more then one entrance. Any ideas or experience out there to help me? By the way the house is huge and three levels.