Squirrels are industrious, acrobatic tree farmers. They can be noisy, gnawing tenants if they move into our homes and they annoy the heck out of some feeders of birds. In the latter case, you may save yourself a great deal of frustration by becoming a squirrel watcher. Click the picture below for some amazing inspiration.
This chapter from the Humane Society of the United States publication Wild Neighbors: The Humane Approach to Living with Wildlife , by John Hadidion has some solutions for squirrels living in houses, trapped in chimneys, damaging plantings, and more.