They get the name triggerfish from the large fin ray that can be held upright (like the trigger of a gun) by a pawl joint. This allows them to wedge themselves into a rock crevice in case of danger. The pectoral fins are small. The anatomy of the triggerfish reflects its typical diet of slow-moving, bottom-dwelling crustaceans, molluscs, sea urchins and other echinoderms, mostly creatures with protective shells and spines. Many also catch small fish and some, particularly members of the genus Melichthys, feed on algae.They have strong white teeth that allow them to bite into hard prey, such as a shell or sea urchin, or coral. Their small eyes are placed on top of the head, and can move independently. They have tough scaly skin.
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