Discuss Balrog's answer to: What to do about squirrels, they go in my bird ...

You could call a professional exterminator, terminix, e.g.  You could head on down to a sporting goods store, pick up a pneumatic .22cal pellet gun with a scope sight, and exterminate them yourself.  You could get a cat or two from a local animal rescue organization and let the cat(s) patrol your yard.  You could purchase a couple of live traps, some are designed specifically for squirrels, set them out, and transport the squirrels to a (distant) different location.  There are several different kinds of electronic apparatus that claim to repell squirrels and other rodents.    Any of these solutions are going to cost you some money.