If you have squirrels in your attic, follow these steps to remove them, effectively and humanely:
There Are Probably Babies: Squirrels typically enter an attic or other part of a building for one reason: to have a safe place in which to give birth and raise young. Males rarely enter an attic space. A pregnant female squirrel instinctively seeks out a nesting area. Our man made structures provide great shelter - warm, dry, safe from predators. Squirrels give birth twice per year, roughly in late summer and late winter. You must be aware that if you have a squirrel in the attic, there is almost surely a nest of babies. You can not simply remove the mother squirrel. If you do so, you will leave the nest of baby squirrels to starve to death. This is cruel, and the decaying bodies can cause odor problems. Wait. The nest of baby squirrels grows quickly, and by six weeks old, are nearly adult size and mobile.
Don't Use Cage Traps: Cage traps may have names like "Havahart", and you may think that catching a squirrel alive and relocating it elsewhere is a humane approach. However, it is not. Squirrels caught in cages usually injure themselves by frantically banging against the steel cage. They often kill themselves. In addition, a squirrel can succumb to heat stroke or death by stress or exhaustion in a cage trap very quickly. If you do relocate the squirrel elsewhere, it will be in unfamiliar territory that is either unsuitable to survival, or is the territory of other squirrels, and the animal will slowly die of starvation or stress. It also puts stress on any squirrels already living in that area. Live cage trapping may seem humane, but it's usually the most cruel.
Use a One-Way Exclusion Door: This is a far better means of removing squirrels than a cage trap. When mounted on the squirrels' normal entry/exit hole, a one-way exclusion door allows the squirrel(s) inside the attic to exit, but not re-enter the building. It's a one-way exit! The squirrels are then stuck outside, and unable to get back inside. They still live in their native territory, with a higher chance of survival, and the added bonus of keeping other territorial squirrels at bay. A one-way door has the highest rate of success, since cage traps don't always work. It gets only the target squirrels, the ones in your attic, instead of catching other neighborhood squirrels. And most of all, it gets all the squirrels out at once, with less effort than repeated cage trapping.
You Might Be Able to Scare Them Out: In some cases, you might be able to indimidate a female squirrel into leaving the attic space without the need to trap or use one-way doors at all. If you can address it before she gives birth, and can convince her that your attic is an unsuitable place in which to nest, she may just pick a new nesting area. Find the entry hole into your house, and smear or spray raccoon eviction fluid around and in the hole. This may intimidate her into moving on. You can also enter the attic and make your presence known, or bang on the ceiling and wall spaces in which you hear them. You can try things like a radio, vinegar or ammonia-soaked rags, or flashing lights, but these tactics have little to no demonstrated effectiveness, especially if a nest is already present.
Simply Seal Them Out: At some point in the process, you will have to seal your house and make it squirrel-proof. If you've extracted all of the squirrels with a one-way door, the final step is to remove the door and seal the entry hole shut. But you can also take a risk and simply seal the holes during daylight hours, most likely morning and late afternoon, when the squirrels are naturally outside foraging for food and water. Seal all entry holes with steel screen or metal flashing reparis that are sturdy and chew-proof. This strategy is risky, because you can't be sure the squirrels are outside, you can't be sure the are all outside, and you can't be sure if there's a nest of baby squirrels, which is likely. If you seal the hole(s) and still hear noise, open the holes immediately!
Never Use Poison: There is no registered, legal, or effective poison manufactured for the extermination of squirrels. Some people call squirrels "just rats with bushy tails". And it's true that both rats and squirrels are rodents. It's also true that the use of rodenticides is a common approach to rat control employed by pest control companies. But here's the thing: first of all, squirrels don't eat anything inside the attic, and very rarely eat any of the rat poisons sold. Second of all, the use of poison is a terrible approach to rat control. It doesn't work. It's lazy and profitable for pest control companies, who want to sign you up to a never-ending monthly contract and never lose you as a customer (thus they want to never solve the problem). Poison does not kill all the rats, and the ones it does, usually die in the house and cause a horrible odor. The attempted use of poison is doubly stupid for squirrels.
The most common animal to invade the attic of a house is the Eastern Gray Squirrel (Sciurus carolinensis) which lives throughout most of the United States and the west coast. These adaptable urban rodents are adept
at climbing, exploring, and chewing. They like to live in tree hollows or self-constructed nests in trees, but have found that the attics of buildings provide superior shelter. Squirrels give birth twice per year, once
in late summer, and once in late winter, and the pregnant female instinctually seeks out a safe den in which to raise her young. If you have a squirrel in the attic, it's almost certainly a female with a litter of 3-5 babies.
How do you know if you have squirrels in your attic? The most common sign is the noise. Squirrels are active during daylight hours, particularly morning and late afternoon. If you hear noise in the attic during the day, it's almost surely squirrels. If you hear noise in the attic at night, it's more likely rats, mice, raccoons, or even flying squirrels. An inspection inside the attic can also help, if you discover squirrel feces, tracks, or nesting material. However, you may not spot these things, because the activity might be down in the soffit, or concealed by insulation. A thorough inspection of the exterior of the home should reveal some open entry holes. The primary entry hole will likely have some chewing marks.
It is our goal to provide complete instructions for the safe, effective, and humane removal of squirrels from buildings. In short, here is how to get rid of squirrels in the attic: