🏖️ Vacationers lounging on pristine white sands are often unaware of the beach's bizarre origin. According to scientists, up to seventy percent of the white sand on many tropical coasts is actually produced by parrotfish. Named for their vibrant colors and beak-like mouths, these creatures graze constantly on coral reefs. Their main food is the nutrient-rich algae growing on dead coral. To scrape this algae away, parrotfish use incredibly strong, fused teeth made of fluorapatite, a biological mineral much harder than gold or iron.⁠ ⁠ As they bite the reef, parrotfish inevitably swallow chunks of the hard calcium carbonate coral skeleton. To process these rocky materials, they rely on a unique set of pharyngeal jaws located deep in their throats. These internal jaws act as a powerful grinding mill, crushing the rigid coral into a highly refined powder. After digesting the organic algae, the fish excrete the indigestible pulverized coral as smooth, fine white sand. Astonishingly, a sing...