There are some beaches that glow in the dark! Glowing waves are caused by plankton floating in the water, and these tiny animals can have a very bright light. Readers learn fun facts about these microscopic animals, including what they eat, what eats them, and what makes them glow. Fact boxes provide additional information about these creatures and their habitats. Vibrant photographs show individual plankton up close, as well as the groups of plankton that make water appear to sparkle.