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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.

Ticks are most commonly found behind (or even inside) ears, behind knees, in belly buttons, in the hair, and in your underarms. If you find a tick on your body or on your pet, use a pair of clean tweezers to grab the tick as close to the surface of your skin as possible. If you simply yank or twist it, you can leave the tick’s mouth parts lodged in your skin and will need to remove those carefully with the tweezers. 

Once you have removed the tick, flush it down the toilet and wash your skin with rubbing alcohol or soap and water. Know the signs of lyme disease such as fever, chills, headache, muscle aches, and a rash.

When threatened or crushed, stink bugs emit a pungent scent often described as smelling similar to cilantro. However, some people say it can smell like sulfur or ammonia. The scent is produced by a gland on their abdomen and some species can spray the scent too.

Tree sap is not usually dangerous to humans or pets. But some trees do produce dangerous sap. Notably, ash, birch, cedar and similar saps can irritate the skin but aren’t dangerous. Sap from trees like the Brazilwood, Mahogany, Milky Mangrove or well-named Poison Walnut can be corrosive, cause nausea, or trigger those with asthma. But for most backyard trees, protective equipment like a sturdy pair of gloves should be fine.