Through vivid images from throughout the world, this book explores the fascinating features of invertebrate animals. The taxonomy of the different invertebrate phyla are the focus of the program, with special emphasis placed on the evolutionary relationships of the various phyla. Each of the major phyla are discussed going from simple to more complex organisms. Other terminology includes: sponges, cnidarians, flatworms, roundworms, segmented worms, mollusks, arthropods, echinoderms.