People used to think earthworms were just garden pests. Others thought they were just plain yucky! But it is a good thing there are earthworms because they help keep soil healthy. Earthworms are also food for birds, frogs, and other animals. The well-organized chapters help students identify key details. The illustrations and text features such as captions and bold print help students navigate the text while the photographs add clarity and enable students to better understand the text.