This is a parrotfish - and they play a critical role in building and maintaining coral reefs by eating and pooping. They use their sharp beaks to scrape off algae and the microscopic organisms living on the reef surface. During this process, they end up biting off chunks of the coral itself. These coral chunks then move down their throat to their second set of teeth, and its ground up into a fine powder. And then they poop it out. A single large parrotfish produces up to 1,000 pounds of sand per