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Squirrels rely heavily on their sense of smell and are deterred by a variety of scents. Some of the most effective smells for repelling them include peppermint oil, coffee grounds, white vinegar, garlic, cinnamon, rosemary, and predator urine. They also have a strong aversion to capsaicin, the compound that makes chili peppers hot, making capsaicin-based sprays an effective repellent for areas like gardens or bird feeders. For a DIY solution, you can create a spray from garlic and vinegar and apply it daily. Additionally, squirrels dislike strong, fresh scents, so placing items like strong-smelling soaps or dryer sheets in areas they frequent can also help keep them away.

Some birds of prey, like owls, hunt at night. Hawks are diurnal and need good light to see their prey. You could see them circling anytime from dawn to dusk. Species like the common red-tailed hawk are most active in the early morning and late evening when their prey is also typically on the go.

To kill fruit flies outdoors, you'll want to make a homemade insecticide or find a plant-safe, nontoxic product. Fill a garden sprayer with your chosen solution and apply it on your plants and around the base of your home's exterior. Take care to limit your exposure to insecticides, as they can irritate skin and eyes. Always rinse garden fruits and vegetables before eating them.

Birds are often averse to certain strong scents. For instance, the odor of predator urine, such as that from foxes or hawks, can deter them. Similarly, birds may dislike the pungent aromas of garlic, onions, and chili peppers. Essential oils like peppermint, eucalyptus, and citrus can also be effective in keeping birds away. However, it's important to note that individual bird species might react differently to these scents, so it might require some experimentation to find the most effective repellent for your specific situation.