Butterflyfish are known for their attractive, colorful patterns and graceful looks. They are frequently seen foraging the reef, nibbling on live corals or fish eggs with their tiny mouths. This one is called a Threadfin butterflyfish, and is about five inches (13 cm) long, a typical size for an adult. Butterflyfish (family Chaetodontidae) are among the most common varieties of reef fish, appearing in a wide variety of color schemes. This one has a spot near its tail that serves as a false eye, confusing predators. Butterflyfish frequently travel in pairs, which studies show are permanent lifetime bonds. Identification: Chaetodon auriga

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