Mice and Rats and Squirrels - Oh My!

Here are some links with helpful tips for preventing pests from entering your home as well as what to do if they've already made a home in your home.

Dealing with Mice, Bats, Deer, and Other Pests [Real Simple]
How to Keep Pests Out of Your House [This Old House]
Controlling Pests: Roaches, Mice, Rats [Children's Environmental Health Centers]