Introduction to Blue Sea Beach: People diving on Heron Island will always hear a continuous scratching sound. This sound comes from parrotfish, a colorful animal that uses its beak-like beaks to The beak pecks at seaweed on the coral reef. Parrotfish consume an astonishing amount of coral reefs every day. The coral leaks through the fish's digestive organs and is excreted into fine white sand. Up to 3 square feet of fine sand can accumulate each year. After a long period of time, we have created the most romantic beach in the world.