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Using chemicals with harsh odors is a natural way to repel bears. While the animal’s strong sense of smell is an asset in the animal kingdom, it’s a weakness here. Simply place bleach or ammonia in a bucket and leave it outside day or night. Ironically, bears also dislike the smell of pine, so you can use pine oil or a pine-based cleaning agent. Avoid using cleaning products with fruit or citrus smells, however.

If the cat is stray (you noticed a collar or other signs of domestication), the kind thing to do is to try and find the owner. Call around to other neighbors to see if they can lead you in the right direction. If you can get close enough to snap a picture, try posting an image of the cat to local community groups and pages on social media. 

If the cat is feral, you can try to humanely trap them and participate in a local shelter’s TNR program. Before attempting capture, call around to local rescues and shelters to make sure one near you does participate in a TNR program. They may even be able to catch the cat for you.

The primary attractant for moles is food. With a powerful sense of smell, they seek out grubs, earthworms, ants, and other insects in the soil. Other factors can also draw them in, such as moist, loose soil which makes tunneling easier, so an overwatered lawn can be an invitation. Additionally, male moles may enter your yard to expand their territory or find a mate, and if a neighbor has a mole problem, it's possible for them to tunnel over to your property.

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.