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There are several possible reasons for a gnat infestation, and they vary based on the type of insect. One common reason is overwatering houseplants, which can create a moist environment that is attractive to fungus gnats. Another reason is leaving fruit out on the counter for too long, which can attract fruit flies. Drain flies are typically attracted by standing water and bacteria that are often the result of buildup or a clog in your drain or sewer line.

Set live traps or install a one-way door to evict squirrels, rodents, and other animals from your attic. Once they’re out, seal any entry points to prevent the animals from returning. If you’re dealing with an infestation, call a pro. 

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.

It is highly unlikely that fleas will go away on their own without treatment. Female fleas can lay dozens of eggs per day—up to 50—causing their numbers to multiply quickly and spread throughout your home. An adult flea can live for around 100 days or even up to a year as long as it has access to a host, such as a pet or human. Even without a host to feed on, fleas can survive for weeks. Because of their rapid reproduction and resilience, it's best to tackle a flea problem as soon as possible. Hiring an exterminator is recommended to prevent the infestation from worsening.