This is the volume 4 of a series of books that explore the fascinating world of this small little animals that live among us. There are some of them harmless and some of them not. In these books you will have the opportunity to know more about them, how they born feed; grow up, lifespan and how they die. You will learn how to protect yourself, your pets and your plants from the one that are not good to us. There is a lot of important information that you will enjoy.