D. ROBERTS / SCIENCE PHOTO LIBRARY D. ROBERTS / SCIENCE PHOTO LIBRARY
Triggerfish, coloured X-ray. Triggerfish (family Balistidae) take their name from their sharp dorsal fin (orange/white, upper left). This modified fin can be locked in the erect position (as seen) to anchor the fish in crevices in rocks or coral. Triggerfish have a bird-like beak (yellow, centre left), which is used to crack open the shells of their prey. They feed predominantly on hard-shelled animals such as sea urchins, molluscs and crustaceans. There are many species of triggerfish, which are distributed in warm seas throughout the world.
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