GREGORY OCHOCKI / SCIENCE PHOTO LIBRARY GREGORY OCHOCKI / SCIENCE PHOTO LIBRARY
Parrotfish. Head of a parrotfish (family Scaridae). Parrotfish are found in all tropical seas. Their teeth are fused to form a beak-like structure, which is responsible for their name. They use the beak to bite off pieces of coral from reefs. They then grind up the hard coral in their mouths, digesting the tiny polyps and ejecting the ground coral mineral as white sand.
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