The Reef Triggerfish, known scientifically as Rhinecanthus rectangulus, are small, yet aggressive, brightly colored diamond shaped fish. Also known by its Hawaiian name, the Humuhumunukunukuāpua’a, the reef triggerfish is the state fish of Hawai’i. However, Humuhumunukunukuāpua’a is also the name for a separate fish, the lagoon triggerfish. In Hawaiian Humuhumunukunukuāpua’a means “triggerfish with a snout shaped like a pig.” The Reef Triggerfish uses this snout to blow air to disrupt the sandy ocean floor in search of food. The Reef Triggerfish is found in the Indo-Pacific ocean and is known to bite those lucky enough to catch a glimpse of it in its natural habitat, coral reefs, as it is not welcoming to newcomers in its home.

It is also called wedgetail triggerfish or rectangular triggerfish. This triggerfish is easily identified by its "pig-like" snout, angular body, fin arrangement, distinctive color pattern, and characteristic dorsal spine. The teeth and top lip are blue, while the whole body is covered in blocks of colors. It can change body color depending on its surroundings. The eyes are set atop the head, and it has a very strong rigid forward spine on the dorsal fin used for self-defense. The reef triggerfish is a solitary animal and very aggressive.