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There is no exact science here, due to the nature of nests and how mice raise their young, but a good place to start is to inspect the droppings. A single mouse poops a lot, leaving around 50 droppings in a single day, likely near a primary food source. If you find only sporadic droppings, you likely have a small infestation. If you spot large mounds of droppings, you are dealing with a big problem.

As a general rule, if you hear an animal in your attic, don’t assume it will stay there. Animals are drawn to warmth and food sources, which could lead them to other parts of your house. In particular, it’s likely that small pests such as rats and mice that only need tiny gaps to squeeze through will end up in your walls and ductwork. Larger animals like raccoons may be limited to an enclosed attic.

Squirrels follow a diurnal routine like humans, remaining quiet at night because they sleep. Homeowners concerned about squirrels in their homes are more likely to hear these critters in the early morning when they awaken, eager to start their day and search for sustenance. As the sun sets, squirrels wrap up their daily endeavors and return to their cozy nests for the night's rest.

Make it easier for your inspector to do a thorough assessment by preparing your home ahead of time. That includes:

• Noting any signs of pests around the home

• Removing obstacles in the way of the attic, basement, plumbing, garbage, and other key areas that inspectors will need to access

• Keeping children and pets away from inspection areas