For thousands of years, sailors have watched the ocean from the decks of their ships. And many returned from their voyages with tales of mermaids! This accessible text brings together myths from cultures all over the world and highlights the interesting stories of P. T. Barnum's Feejee Mermaid of the 1800s as well as the original "Little Mermaid" fairytale. Readers will explore possible scientific explanations for the many merfolk sightings and consider what they believe. Bright images, a playful design, and graphic elements will keep readers of all levels motivated. A broad spectrum of ideas encourages critical thinking.