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A rodent infestation often has a distinctive, unpleasant smell. The most common odor is a strong, musky scent, similar to stale ammonia, which comes from mouse urine. As the infestation grows, the smell can become more intense. You might also notice a foul, decomposing odor if mice or rats die inside the walls or hidden areas. This combination of smells is a clear sign of a rodent problem and should prompt immediate action to address the infestation.

Aside from a warm, cozy place to curl up, you might wonder what attracts mice to your home. Several items attract mice, including: Birdseed Pet food Water Cereal and whole grains Food scraps from the composting bin Open trash cans High-fat and high-sugar foods Unused cars—they make great homes for chilly mice Insulation in the attic Clutter Brush from your yard, including leaves, sticks, wood, and shrubs (so mice can make nests) Overgrown trees or bushes—mice love to leap from branches onto the roof Indoor nesting materials, including cloth, paper, tissues, and toilet paper Tiny cracks in the siding or foundation

Rats are nocturnal creatures, meaning they are most active at night, typically from late evening through the early morning. They use the cover of darkness to explore, forage for food, and find water, as they feel safer and can avoid daytime predators and human activity. Their sharp senses, including keen night vision and hearing, are well-suited for navigating in the dark. Because they prefer to stay hidden during the day in secluded areas like walls or attics, you are more likely to spot signs of their presence—such as droppings or gnaw marks—before you see an actual rat.

If your house is full of things that attract spiders, you’re more likely to have a population explosion. When you have lots of cracks leading to warm, secure spots in your home, why wouldn’t they want to come in? Especially if your home has plenty of other meal-ticket insects, like flies, roaches, and fleas. Sealing up obvious cracks and gaps and keeping your house bug-free makes it a less appealing place for spiders.