During summer vacations, cousins Luke and Sarah help out at their grandparents' petting zoo. But what happens when the animals get loose overnight? Can Luke and Sarah use their knowledge of animals and their awesome problem-solving skills to get the animals back to safety? Perfect for reluctant, challenged, and newly fluent readers, the Animal Planet Adventures chapter book series combines fun animal mysteries with cool nonfiction sidebars that relate directly to the stories, bringing the best of the animal world to young readers. With full-color illustrations and photographs throughout. Collect all of the Animal Planet Adventures, including Maddie and Atticus's story Dolphin Rescue .