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The largest of the parrotfish, the bumphead, is thought to ram its big head against coral, making it easier to eat.
Bumphead parrotfish are about 130cm in length.
This is a large fish with a hard beak-like mouth, a little like a parrot's bill. It has a sizeable bump on its head. Its body is green or bluish-green, sometime pink at the front of the face. Juveniles lack the head bump.
They are found in Indian and Pacific oceans.
Juveniles inhabit lagoons, adults live in lagoons and on coral reefs.
Parrotfish are herbivores and use their hard beaks to scrape algae and coral from the hard rock surface.
They are commonly found singly, or in small groups, often at night around caves and shipwrecks.
Parrotfish are hermaphrodites, that is, both sex organs being found in every fish. They commonly begin life as females, and undergo physical and physiological changes to become males. Sex change typically happens when the resident male leaves, or dies, with the top female changing sex to replace him.
Bumphead parrotfish are not considered threatened. As algae-eating herbivores, they are important reef fish preventing algae from overgrowing the reef.