Most people know kois as vibrant, colorful fish swimming slowly through a serene Japanese pond setting, transfixing passers-by. Most people don't know that they're some of the oldest living fish in the world. Young readers will love reading the story of Hanako, the 226-year-old, scarlet-colored koi that lived in Japan for centuries. Through vivid color photography and clean, age-appropriate writing, readers will learn about not only kois, but ecosystems, life cycles, environments, and other key science curriculum concepts.