The best-selling I Wonder Why series has always been the perfect place for children to find the answers to their questions. With their quirky style and informative text, these books are great for gripping the imagination and for developing reading skills. Designed to amuse and intrigue the young reader, I Wonder Why Stalactites Hang Down and other questions about caves answers all sorts of fascinating questions that children ask about caves. Illustrated with stunning, high-quality artwork, a wealth of information is backed up with fun facts and lively cartoons. Where is the twilight zone? Why do oilbirds go click-clack? Which insects feed on bat guano? Who buried their dead in caves? - discover the answers to these questions and much, much more.