It's very difficult to remove a squirrel once it has moved into your home; but there is hope for people who want permanent squirrel removal without killing the squirrels. The fact is, it's rare to find a single squirrel in your home. The squirrels you do see are most likely to be mothers, or mothers and their young. If you do manage to trap one, check for nipples. The chances are very good there are young squirrels, unable to fend for themselves or even old enough to enter a cage that belong to her.
Once squirrels are settled in, they're unlikely to move out. And as cute as they can be, they're also a health hazard. Their feces and urine not only smells, but it contain Leptospirosis and Salmonella, both harmful to humans. Squirrels also tend to chew on wiring, leading to potential fires, electrical shorts and dead squirrels (which in turn smell for a long time as they decay). So there are a lot of reasons for catching and removing squirrels who have moved into your home.
The difficulty in catching squirrels without killing them is why most homeowners finally resort to lethal means of removal. But if you're bound and determined to simply evict the animals there are several ways to go about it. First and foremost, don't waste your time or money on things like predator urine (coyote), mothballs or other such so-called "squirrel repellents." They don't work. The Federal Trade Commission says research shows that the electronic devices which attempt to drive animals and pests out with sound don't work either. What does work are traps.
Body Grip Traps: These are a lot like giant mouse traps. They are dangerous, difficult to use and when they work they snap down on the animal and kill it via choking or crushing.
Single Animal Live Cage Trap: Live cage traps are generally metal cages. The squirrel is lured in with food, trips a pan or plate which shuts the door and traps the squirrel. If you use a live cage trap, get one for squirrels. Too small a cage and the animal won't fit in, too large a cage and the squirrel will run around and hurt itself trying to escape.
Repeating Live Cage Trap: This is the trap the professionals use. It's mounted on the hole the squirrels use to enter and exit the house. They have no alternative but to enter the trap as they come and go. A one-way door lets the squirrels in, but not out. These traps can easily hold several squirrels.
One-Way Exclusion Door: Professionals claim this is the best method for evicting squirrels from attics. It's like a repeating live cage trap, but instead of trapping the squirrels, it simply blocks them from returning once they leave. The squirrels will still be on your property, but not in your attic. Be careful if you have mother squirrels that they don't have babies inside they can't get to.
There's more to catching a squirrel than simply putting out a trap. Even the pros have trouble catching squirrels. So if you aren't having any luck, there's no shame to calling an expert. If you are lucky enough to trap a live squirrel and you want to relocate it, be aware that relocating squirrels is illegal. If you're not worried about the law and want to relocate the animals anyway, move them at least 5 to 10 miles away. Like most animals, they're very good at finding their way back home.