National Geographic : 2011 May
e clownish grin of a bridled parrot sh reveals its power tools: grinding teeth used to scrape algae from rock. ough sometimes destructive to individual corals, the sh's e orts are mostly bene- cial.Without them, algal growth could smother the reef. SCARUS FRENATUS labyrinth. Not far beneath the surface, jagged towers of coral tore into the ship's hull and held the vessel fast. As timbers splintered and the sea poured in, the crew arrived on deck "with countenances which su ciently expressed the horrors of our situation," Cook later wrote in his diary. Captain and crew were able to limp to a river mouth to patch their vessel. Aborigines had lived in the region for thou- sands of years before Europeans hit the rocks.