A spider?s web is made from silk. Spiders can spin different kinds of silk. Some strands are sticky. Other strands are dry. Find out more in Spiderwebs, a title in the Nature?s Engineers series. Nature?s Engineers is a series of AV2 media enhanced books. Each title in the series features easy-to-read text, stunning visuals, and a challenging educational activity. A unique book code printed on page 2 unlocks multimedia content. These books come alive with video, audio, weblinks, slideshows, activities, hands-onexperiments, and much more.