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These now-extinct cephalods were the predecessors of modern-day squid, octopus, and nautilus and survived for nearly 335 million years! Young readers will discover how these shelled creatures came in myriad shapes, sizes, and designs, and how they managed to outlast several mass extinctions until about 65 million years ago. The Exploring Dinosaurs and Prehistoric Creatures series is the first stepping-stone in developing a child's knowledge of prehistoric natural history. By learning about the incredible creatures of the past, readers begin to understand modern-day animals as well as the delicate balance of the world's environments. From the habitats of prehistory to the fossil hunters of the early twentieth century and the revolutionary discoveries of today, these books present a wealth of information about dinosaurs and other prehistoric creatures, how they were discovered, and the mysteries of their ancient worlds.