A number of recent titles for young readers describe the work of humans to make lives better for injured or abandoned animals. Unusually, here the special focus is on the process: the complicated and painstaking repair of Karl's lower beak, including the construction of its replacement part. Thoughtful design makes this very clear: Illustrations cleverly combine actual photographs with drawings and diagrams, printed in blue and white like blueprints.Backmatter includes more facts about hornbills in the wild and about Karl in particular as well as a glossary with unusually helpful definitions. For fans of animal-rescue accounts and 21st-century technology.