What is a naturalist? What are shells? Do they have a diet? How do they defend themselves? Are they preyed upon? Can they move? Where can you find them on land? In the water? Easy identification of the 50 most common shells in North America, with vivid photographs and illustrations that capture the beauty and variety of shells, including saltwater, freshwater and land shells. Special features include information on how to begin a shell collection, where to look for shells and mollusks, and how to conserve endangered shells.