Track the facts with Jack and Annie!   When Jack and Annie came back from their adventure in Magic Tree House #53: Shadow of the Shark, they had lots of questions. How many teeth do sharks have? What is their favorite food? What are some other top predators? How do they keep life in balance? Find out the answers to these questions and more as Jack and Annie track the facts about sharks and other predators.   Filled with up-to-date information, photographs, illustrations, and fun tidbits from Jack and Annie, the nonfiction Magic Tree House Fact Trackers are the perfect way for kids to find out more about the topics they discover in their favorite Magic Tree House adventures. And teachers can use Fact Trackers alongside their Magic Tree House fiction companions to meet Common Core text-pairing needs.   Have more fun with Jack and Annie on the Magic Tree House website at MagicTreeHouse.com!