Porcupines are best known for the long, pointed quills growing from their back and sides. A porcupine can have as many as 30,000 quills. Find out more in Porcupine, one of the titles in the Backyard Animals series. This exciting series will teach you about some of the most interesting animals you might encounter in your own back yard. Readers will explore the physical features, diets, natural habitats, life cycles, myths and legends, and history of these fascinating creatures. Backyard Animals is a series of AV2 media enhanced books. A unique book code printed on page 2 unlocks your interactive eBook. These books come alive with video, audio, weblinks, slideshows, activities, hands-on experiments, and much more.