Big fish with a large hump on the forehead and beak-shaped mouths. Adults are uniformly greenish, juveniles are brown to green with white spots on the side. They are mostly seen in feeding groups up to 30-40 animals strong.
Since 2012 globally considered rare due to overfishing. Healthy populations remain in some areas
Indo-Pacific: Red Sea and East Africa to Samoa and the Line Islands, north to the Yaeyama and Wake islands, south to the Great Barrier Reef and New Caledonia. The live in a depth range of 1-30 meters.
Up to 130cm.
It feeds on benthic algae, live coral and shellfish. It uses its head to break off coral and its beak-like mouth to bite it off.
It sleeps in caves or wrecks.