It doesn't just spend its days hee-hawing good-naturedly through the Caribbean, though: Parrotfish are directly responsible for some of the most beautiful white sand tropical beaches in the world. Or rather, their poop is. That's basically all white sand is -- parrotfish shit.
The parrotfish's pitiable horse teeth actually serve a purpose -- namely, grinding up chunks of coral. Once it finds a particularly tasty-looking reef, the parrotfish will bite off a piece and chew it up with those oversized self-help-guru veneers, extracting the algae that makes up a large part of its diet. The useless coral waste is then passed through its digestive tract and back out onto the reef in the form of pristine anal sand.