Dip your toes into the cool water and look closely at the darting shadows below the surface. Have you ever heard of a fish that builds its own nest? Welcome to the surprising underwater world of the small but mighty stickleback. This engaging guide takes you into the fresh and saltwater habitats of northern countries to uncover the secrets of this fascinating creature. You will discover the incredible ways the stickleback prepares for its family, including the male's special job of building a safe nest to protect the tiny eggs. Learn step-by-step about their unique life cycle, their lively habits, and how these little fish survive in their busy aquatic homes. Dive deep into the science of the stream and see the remarkable daily life of the stickleback like never before.