Learn all about spiders. What distinguishes spiders from insects? How do spiders make webs? Why are spiders vital to our ecosystem? What are the largest and smallest spiders in the world? Which spiders are the most unique and why? The answers to these questions and many more are covered with detailed graphics, diagrams and exciting video, as well as on-screen, multiple-choice reviews at the end of each segment that reinforce important concepts and make learning fun.