ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Wrassse (Cheilinus sp.) swimming past a coral reef. Wrasses vary greatly in size, shape and colour, but all have proportionally large lips. Most species are capable of changing sex as they mature; female wrasse often become brilliantly coloured males in adulthood. Photographed in the Red Sea.
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