Images from Free Willy and captive killer whales performing at Sea World don't tell the real story of these marvelous creatures. With their vast bulk and "killer" instincts, these predators - weighing up to ten tons and eating more than 100 pounds of food a day - rule their underwater world. This lively book introduces young readers to every aspect of these singular beasts, from their surprising social arrangements (living in lifelong family groups)...