Each book begins with a general overview defining a life cycle. Then, it delves into background information about the subject. There are so many fascinating facts about snails in the book, such as how they move, sense, and eat. Even though children will likely be more familiar with earthworms, there is still much to learn. For instance, they use their skin to detect light and to breath air. Next, their origins, early lives, and adulthood are described, which includes their habits and predators. Finally, the reproductive process is explained. Interestingly, snails and earthworms have both parts necessary to reproduce. Each book is rounded out with a colorful 2-page summary of the life cycle.
As an adult, I found myself expanding my own schema of knowledge, but the information is written in a manner that youngster will understand. The text is well-written and appealing. One of the highlights is the large, vibrant photographs of their stages and behaviors. Many are rare action shots like a mole eating a worm or a snail laying eggs.
I recommend this Life Cycle series for ages 7 and up. In addition to the earthworm and snail, the following living things are covered: butterfly, chicken, clown fish, daisy, fern, frog, human, ladybug, polar bear, and snake. These books are a wonderful supplement or extension of a science curriculum. Many families will, also, find them to be educational leisure reading.