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>The reef triggerfish (Rhinecanthus rectangulus), also known as the rectangular triggerfish, wedgetail triggerfish[1], or by its Hawaiian name humuhumunukunukuāpuaʻa (pronounced [ˈhumuˈhumuˈnukuˈnukuˈwaːpuˈwɐʔə], meaning 'triggerfish with a snout like a pig'[2]), also spelled humuhumunukunukuapua'a or just humuhumu for short, is one of several species of triggerfish. It is found at reefs in the Indo-Pacific[3] and is the state fish of Hawaii.
>The fish has a small second dorsal spine, which it can use to lock its main spine into an upright position. Locking its spine while sheltering inside a small crevice helps protect the fish against being extracted by a predator. When fleeing from predators, the triggerfish will sometimes make grunting noises, possibly a call to warn other nearby triggerfish of danger.
>The triggerfish can blow jets of water from its mouth, which help the fish find benthic invertebrates that may be buried under the substrate. Triggerfish can often be seen spitting sand from their mouths in order to sift through the material in search of edible detritus or organisms.
>Triggers have the ability to rapidly alter their coloration. They can fade into a relatively drab appearance when sleeping or demonstrating submission, while their coloration is often the most vivid when the fish are healthy and unthreatened by their surroundings.
