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Some distinctively marked triggers include the Picasso trigger (Rhinecanthus aculeatus), so-named for its cubist markings, and the undulate trigger (Pseudo-balistes fuscus), covered with wavy markings. The largest trigger you will see on the Indonesian reefs is the Titan triggerfish (Balistoides viridescens), a loopy-eyed and sometimes aggressive animal that grows to more than 60 centimeters.

The most dramatic of the family is the clown triggerfish (Balistoides conspicullum), with its bright orange snout, blue body, and white-spotted belly. The clown trigger is very territorial, and will patrol the same area of reef. When threatened, a clown trigger will wedge its body head-first into a crack in the coral wall, and extend its dorsal spine. The first spine, once raised, is locked in place by the second, making it impossible to pull the fish out of his hole. A diver who knows what he is doing can reach in and gently push back the second spine, unlocking the fin. He can then extract the irritated fish.