MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY
Napoleon wrasse (Cheilinus undulatus) with a scuba diver. Also called the humphead wrasse, this is the largest of the wrasses, reaching a length of over three metres. It is found on coral reefs throughout the tropical Indo-Pacific region. It is mainly carnivorous, feeding on molluscs and crustaceans. Elderly individuals develop a large fatty hump above their eyes.
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