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.

Spraying for ticks does a good job of eliminating the existing ticks in your yard. Moderate to severe infestations might require several treatment sessions, but most infestations are well controlled with enough treatments, regardless of their severity.

However, wildlife, pets, and people can still carry ticks into a yard, even after treatment, so if you're concerned about ticks in your area, it's a good idea to spray annually for tick prevention.

To keep animals out, you must prevent them from entering. As long as they can get in, the problem will persist. That said, consider making your attic less inviting using deterrents like motion-activated lights or ultrasonic devices. Additionally, keeping a well-maintained, clean, and uncluttered attic that you regularly inspect for activity may make the space less attractive to critters.

Keep flies out of your house by keeping the windows or doors closed, especially when cooking. You can also install window screens to prevent pests from entering your home while allowing a cool breeze to enter your home.