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.
That's why sand rushes for your butt crack -- it's trying to get home.
The typical parrotfish can produce over 200 pounds of sand in a year. Much of it ends up washed ashore, forming large parts of the gorgeous tropical beaches you see in commercials and travel brochures. And they're not exactly a new or endangered species, which means the parrotfish population has been dooking out grains of resort icing for an incredibly long time.
Alessandro Dona/Wiki Commons
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