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Small animals, particularly rats and mice, like to burrow inside pool heaters. To keep them out, seal any entry points with caulk or steel wool. Then, place mothballs inside or around your pool heater. As a final measure of protection, you can cover the pool heater in hardware cloth or wood paneling to further block entry points.

Gophers do not hibernate, meaning you could, at least theoretically, have a gopher problem in your yard any time of year. During the colder parts of the year when soil isn't as easy to work with, gophers may not dig as many holes or be as active and instead will burrow deeper into the earth to go below the frost line to stay warm.

You can expect to see more gopher activity during the spring and fall when warmer temperatures make digging easy, and there is an abundance of new (or recently harvested) plant life available for them to graze on. They come out during the day and sleep at night.

Keeping your pool cover clean is a good way to keep smaller animals from running across it or using it as shelter. Small animals may use leaf debris on top of the cover to hide. Cleaning also removes nuts that may fall from a nearby tree that could otherwise be a tempting snack for some animals, like squirrels. 

The same heat treatment that’s effective on flea eggs will also destroy the adults. There are four stages of the flea life cycle—egg, larva, pupa, and adult—and you’ll have to keep all of them in mind when taking on a pest infestation in your home.