Not all marine wildlife lives completely underwater. While some mollusks do, others live both above and below the water's surface--depending on the species. As readers learn about the different classes of mollusks in this volume, they uncover how a mollusk's body allows it to do amazing things! They also learn about the unique ways different mollusks, from slugs to squid to clams, contribute to their environments. The lifestyles, diet, and threats to mollusks come to life in the pages through vivid photographs and age-appropriate text.