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Squirrels hate not having access to secure shelter or food sources. Your best line of defense is to make your property less attractive by removing access to these things. There are chemical squirrel repellents, but these have mixed success. According to Pennsylvania State University, you can apply products containing the bittering agent denatonium saccharide to a squirrel's favorite fence, tree, or roof spots. However, you need to reapply repellents regularly, which aren’t scientifically proven effective.

Scented mouse deterrents, like peppermint oil, can be effective in the short term. The pungent smells may temporarily repel mice, but they lose effectiveness as the scent fades or mice get used to it. The main drawbacks are frequent reapplication and the fact that these deterrents don't address the root cause of the infestation, such as entry points or food sources. While they can be part of a broader strategy, scented deterrents alone are rarely enough to eliminate a mouse problem.

Studies indicate that owls don't possess a conventional sense of fear. However, they find intense, sudden human noise unsettling, like clapping or shouting. Additionally, owls are likely spooked by sudden bursts of bright light. While they may not experience fear as humans do, these disturbances can disrupt their natural behaviors, making it essential to minimize such disruptions when sharing spaces with these remarkable creatures.

Ask your friends and family for recommendations for exterminators. You can also browse online for reputable ant control companies in your area—make sure they have glowing reviews and the proper licenses and permits. 

Give them a call, and they can take a look at your infestation, determine the type of ant they’re dealing with, and give you a cost estimate. Then, you can compare quotes and choose the pro that’s right for you.