If you already have a raccoon problem, obviously your first step should be to get the animal out of the house as soon as possible. This is not difficult to do. Raccoons are nocturnal with a natural aversion to bright lights and noise. So if you shine a light directly on the animal, it –– along with any babies –– should move camp rather quickly. Expect hissing protests, so maintain a very safe distance and be sure the animal has a clear way out of the space. Keep your pets inside because the raccoon might not exit, especially with its litter, if it senses danger outside. If you feel uncomfortable about undertaking the eviction — perhaps the spot is too tight or the raccoon seems too threatening — call in an animal control officer immediately.

When your guest has finally departed, make sure to disinfect the previously occupied area. Be aware that raccoon feces can contain harmful parasites, so be sure to clean thoroughly, wearing thick gloves and a mask.

One final note: never try to trap a raccoon yourself as it could attack you and it might be rabid. (If you notice a raccoon acting strangely and/or threateningly — whether it's inside or outside your house — immediately call San Francisco Animal Care & Control at (415) 554-6364. State law also prohibits the poisoning, trapping or relocating of raccoons without approval from the California Department of Fish & Game, so leave dispatching and deportation up to the professionals.

For more information on these furry visitors, visit the Web site for the Humane Society of the United States.