In September 2009, researcher BJ Kirschhoffer was studying polar bears in Churchill, Canada. There were bears everywhere, but something strange was happening to the animals. Some did not look healthy. Many of them were skinny—BJ could even see their ribs through their white fur. These were not well-fed bears. BJ knew that something was very wrong, but what was causing this problem? In Polar Bear: Shrinking Ice, kids go on a real-life adventure with wildlife biologist BJ Kirschhoffer as he solves the mystery of the skinny polar bears. Along the way, children will learn how polar bears survive in their bone-chilling environment, including how they hunt, stay warm, and raise their babies. Large, full-color photos and a narrative format will keep readers turning the pages for more.