Sharks and goldfish can seem very different, from their habitats to their diets. Sharks are big and live in the salty ocean, while goldfish live in small freshwater ponds or bowls. Sharks eat fish, and goldfish eat plants and packaged fish food. But they both have physical traits such as gills, scales, and fins, that let them live underwater. Can they possibly be related? Through easy-to-read text, colorful photos, and a comprehension quiz, readers will learn about the behaviors, senses and skills, and habitats of these fish relatives by exploring their similarities and differences.