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Badgers have a strong sense of smell, so it’s possible you can deter them with strong scents, such as applying citronella oil to the bottom of your fence, adding crushed scotch bonnet peppers sprinkled throughout your garden, or mixing both of these into a solution to spray around your home and garden.

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.

Some of the best smells for keeping squirrels away are those that have a spicy or pungent odor. This includes pepper, garlic powder, vinegar, mint, and coffee. Just be careful when handling cayenne or chili pepper. Don’t touch your face to prevent getting some in your eyes, and be sure to keep it away from children and pets.

Animals that dig holes in the yard at night include skunks and raccoons. Both animals are nocturnal, meaning they are most active at night and use that time to hunt or forage. Skunks will dig small holes to find insects, while raccoons use their strong front legs to pull up chunks of sod and search for food underneath.