Butterflyfishes have striking color patterns, delecate shapes, and graceful swimming movements. They are frequently seen in pairs, and some remain paired for life. Many species of butterflyfishes are known obligate corallivores, such as C. trifasciatus, C. lunulatus, and C. ornatissimus. Others feed on benthic invertebrates, especially polychaete worms and small crustaceans, such as Forcipiger and Chelmon, and C. auriga. Then there are ones that prey largely on zooplankton, feeding in large aggregations in the water column, such as H. zoster and Heniochus diphreutes.