Habitat: Marine, reef-associated. Ventures into adjacent sand, rubble or seagrass habitats. Depth range 2 - 275 m. Natural History Notes: Adults feed on a great variety of invertebrates but most heavily on sea urchins. Reported to feed on long-spined urchin (Diadema) by blowing water to overturn it or by repeatedly picking it up by a single spine and letting it fall until it lands defenselessly upside down. Once in this position immediately broken up and devoured. May form schools, sometimes solitary. Possess a locking mechanism (trigger) in the spinous dorsal fin. Ability to rotate the eyes independently . Characteristics: Two bright blue stripes below the eye, the lowermost continuous with a blue ring around lips. Dark lines with yellow edges radiating from the eye. Undergoes considerable changes in color, from pale yellowish brown to blue-green to to deep brown. Streaming tips on rear dorsal and tail fin. Juveniles : Rows of small spots form diagonal lines on back.