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Yes, bears can smell through walls if they are close enough. Estimates vary, but experts say bears can smell up to a maximum distance between one and 20 miles. Food inside a house does not attract bears to the degree that food left outside does, though.

A squirrel in a chimney may sound like gnawing since they like to chew through a wide range of materials. You may also hear a persistent scratching sound if they’re trapped inside and unable to get out themselves. Other evidence of a squirrel in your chimney includes holes on or around your chimney as well as droppings or damage to roof shingles or wiring.

You can use commercial repellents to help deter rodents, but they often have mixed results. A better solution is preventing rodents from getting under your home in the first place. Using steel wool or foam sealer, plug all potential entry points like gaps and cracks in the foundation. 

Also, consider installing hardware cloth or wire mesh over vents, utility openings, and any openings under the porch or foundation. Regular inspections and maintenance will aid in early detection and prevention, ensuring a rodent-free environment beneath your house.

Maintaining a clean environment can deter spiders to a certain extent by removing clutter and reducing the number of insects they prey on. Spiders tend to favor secluded spots to spin their webs and hunt for prey, and regular cleaning practices such as dusting, vacuuming, and decluttering can disrupt these ideal conditions. Despite these preventive measures, some spider species are highly adaptable and may still infiltrate your home despite your best efforts to maintain a tidy living space.